Drain pipe assembly for installation of washstand

ABSTRACT

A drain pipe assembly for installation of a basin includes: a drain pipe which is inserted in a drain port formed in a base of basin and has a flange of which an upper end is caught by the drain port; and a fastening member which fixes the basin against the flange, wherein the fastening member pulls the drain pipe, which is exposed below the basin, in a downward direction, to upwardly press the basin, thereby fastening the basin and the drain pipe.

TECHNICAL FIELD

The present invention relates to a drain pipe assembly for installationof a washstand, and, more particularly, to a drainage pipe assembly tobe connected to a washstand, through which water is discharged from abasin to a drain.

BACKGROUND ART

In general, a washstand has a drain system to discharge water from abasin to a drain or the like. Korea Utility Model Publication No20-0459796 (Apr. 25, 2012) discloses a drain system for a washstand.FIG. 1 is a cross-sectional view illustrating the drain system for thewashstand according to the related art.

As illustrated in FIG. 1, the drain system for the washstand accordingto the related art includes a pop-up drain 10, a hose 20, and a drainpipe 30. A basin 1 is a container with an opened top to store watertherein, and is provided with a through-hole in a center portionthereof, and a pop-up valve of the pop-up drain 10 is provided in thethrough-hole. The hose 20 is made of a flexible tube, and the drain pipe30 is made of a metal tube, such as stainless steel, in order to connectthe hose 20 and the drain 3. However, the drain system for the washstandaccording to the related art which is illustrated in FIG. 1 has problemsin that since durability of the hose 20 is weak, the hose is easilybroken, and in that the drain system is configured to give off a badsmell. Therefore, it is a recent trend to replace the whole drain pipeby a metallic material.

FIG. 2 is a cross-sectional view illustrating a drain pipe assembly forinstallation of a washstand according to the related art. As illustratedin FIG. 2, a drain pipe 2 is installed to the through-hole provided in abase of the basin 1, and an upper end of the drain is provided with arim 21 that extends outwardly in a radial direction, so that the drainpipe 2 is supported by the top surface of the base of the basin 1. Apacking member 22 is interposed between the rim 21 and the top surfaceof the base of the basin 1. Also, the drain pipe 2 is fastened to thebottom surface of the base of the basin 1 by a nut 24, and thus thedrain pipe 2 is engaged to the basin 1. A packing member 22 and a washer23 are, interposed between the nut 24 and the bottom surface of the baseof the basin 1. A lower end of the drain pipe 2 is coupled to a trappingpipe 4 with a bent flow path in order to prevent gases or bad smellsfrom being flowing backward, or alien matters or bugs from coming in.

Explaining the method of assembling and disassembling the drain pipeassembly for instillation of the washstand according to the related art,the drain pipe 2 is firstly inserted into the through-hole formed in thebase of the basin 1 from an upward direction to a downward direction,the lower end of the drain pipe 2 is coupled to the upper end of thetrapping pipe 4, and then the drain pipe 2 is fixed to the basin 1 byfastening the nut 24. When the drain pipe 2 is disassembled, the nut 24is unfastened, the lower end of the drain pipe 2 is released from theupper end of the trapping pipe 4, and then the drain pipe 2 is withdrawnfrom the through-hole formed in the base of the basin 2, therebycompleting the disassembling work.

However, the drain pipe assembly for installation of the washstandaccording to the related art has problems in that a special tool isrequired to fasten or unfasten the nut when the drain pipe is assembledor disassembled; replacing and repairing work is inconvenience, and alot of working hours are needed.

DISCLOSURE Technical Problem

Therefore, the present invention has been made in view of the aboveproblems, and an object of the present invention is to provide a drainpipe assembly for installation of a washstand that can easily assembleor disassemble a drain pipe without a special tool, and can omitfastening work between the drain pipe and a trapping pipe.

Technical Solution

According to one aspect of the present invention, there is provided adrain pipe assembly for installation of a basin, including: a drain pipewhich is inserted in a drain port formed in a base of basin and has aflange of which an upper end is caught by the drain port; and afastening member which fixes the basin against the flange, wherein thefastening member pulls the drain pipe, which is exposed below the basin,in a downward direction, to upwardly press the basin, thereby fasteningthe basin and the drain pipe.

The fastening member includes a sliding member in which the dram pipe isslidably inserted in a longitudinal direction, a first spring memberwhich receives the drain pipe, of which a lower end is brought intocontact with the sliding member, and an upper end is brought intocontact with a bottom surface of the base of the basin to resilientlypress the bottom surface, and a fixing member which fixes the slidingmember to the drain pipe.

The fixing member has a latch which is rotatably connected to thesliding member, and a second spring member which resilient supports thelatch in a rotation direction to press the drain pipe.

An outer peripheral surface of the drain pipe is formed with a recessedgroove for receiving the latch.

A lower end of the drain pipe is connected to a trapping pipe of which atrap is filled with water by a bent flow path.

A lower end of the sliding member is connected to a trapping pipe ofwhich a trap is filled with water by a bent flow path.

The fastening member includes a sliding member in which the drain pipeexposed below the basin is slidably inserted in a longitudinaldirection, a handle which is rotatably connected to the sliding member,and a link member which is rotatably connected to the handle at aposition spaced apart from the position where the handle is rotatablyconnected to the sliding member, in which the drain pipe is formed witha recessed groove, the link member being inserted in the recessed grooveand being caught by the recessed groove.

The link member has a first link member, of which an, upper end isrotatably connected to the handle, and a lower end is formed with alocking groove, and a second link member, of which an upper portion isinserted and connected to the locking groove, and a lower portion isextended toward a side of the drain pipe.

The sliding member has a guide portion formed with a slot which receivesthe second link member to guide the second link member sliding in, avertical direction; a lower end of the second link member is extendedtowards a side of the drain pipe beyond the sliding member; and a springmember is further interposed between the second link member and an innerwall, of the guide portion to urge the second link member toward thedrain pipe.

The recessed groove is formed in such a way that an upper side isinclined in an extending direction of the lower end of the second linkmember.

The fastening member presses a side of the drain pipe, and upwardlypresses a bottom surface of the base of the basin in a longitudinaldirection of the drain pipe, thereby fastening the drain pipe to thebasin.

The fastening member includes a sliding member in which the drain pipeis slidably inserted in a longitudinal direction, a pressing memberwhich is positioned above the sliding member, in which the drain pipe isslidably inserted in the longitudinal direction, a first spring memberwhich is provided between the sliding member and the pressing member, ofwhich one side is brought into contact with the sliding member, and theother side is brought into contact with the pressing member to press thepressing member toward the basin, and a fixing member which detachablyfixes the sliding member to the drain pipe.

The sliding member is provided on the side thereof with at least onethrough-hole which penetrates a wall of the sliding member in awidthwise direction, and the drain pipe is formed with a recessedgroove; the fixing member has a locking member having a pressing bosswhich protrudes from an inner surface thereof to face an outside of thesliding member, in which the sliding member is slidably inserted in thelongitudinal direction, a second spring member which is provided betweenthe sliding member and the locking member to upwardly press the lockingmember, and a ball member which is seated in the through-hole formed inthe sliding member; the pressing boss of the locking member inwardlypresses the ball member in a widthwise direction, and the ball member isinwardly exposed through the through-hole and then is seated in therecessed groove, so that the sliding member is fastened to the drainpipe; and the first spring member presses the pressing member in anupward direction, so that the dram pipe is fastened to the basin.

The locking member has a stopper boss which is positioned below thepressing boss and protrudes inwardly from the locking member in awidthwise direction, and the sliding member has a seating boss which ispositioned below the through-hole and is extended outwardly in thewidthwise direction; and the seating boss is positioned between thestopper boss and the pressing boss in the longitudinal direction, and anend of the seating boss is positioned outer than an end of the stopperboss in the widthwise direction.

A widthwise distance from an inner end of the recessed groove to aninner end of the pressing boss is larger than a diameter of the ballmember, and a widthwise distance from an outer surface of the drain pipeto the inner end of the pressing boss is smaller than the diameter ofthe ball member.

The fastening member has a trapping portion having a sliding member, anda first spring member which is provided between the sliding member andthe basin, in which the drain pipe is inserted; and the first springmember is compressed between the sliding member and the basin.

The sliding member is engaged to the drain pipe by aninterference-fitting manner.

The sliding member is threadedly engaged to the drain pipe.

An O-ring is further provided between the sliding member and the drainpipe; the drain pipe is formed with a recessed groove, and the O-ring ispositioned in the recessed groove; and the sliding member is engaged tothe O-ring by an interference-fitting manner.

The drain pipe is provided with a locking boss which protrudes towardsthe O-ring; when the sliding member is engaged to the drain pipe, theO-ring is expanded while the locking boss passes the O-ring, and thelocking boss is positioned below the O-ring to support the O-ring.

The sliding member is formed with a fitting groove which extendsdownwardly from the upper end in the longitudinal direction, and alocking groove which is formed in the circumferential direction belowthe upper end, of which an end is connected to the fitting groove; thedrain pipe is provided with a locking boss protruding from an outerperipheral surface thereof; and the locking boss is slid along thefitting groove of the sliding member, and then is slid along the lockinggroove until the locking boss is locked to the locking groove, therebythe sliding member is engaged to the drain pipe.

The sliding member is a coupling for a hydraulic hose, and the drainpipe is formed with a groove; and the sliding member and the drain pipeare connected to each other by coupling engagement.

The fastening member includes a sliding member in which the drain pipeexposed below the basin is slidably inserted, a clamp member which ispositioned between the sliding member and the drain pipe to clamp thedrain pipe and thus hold the sliding member, and a first spring memberwhich receives the drain pipe in a vertical direction and is providedbetween the basin and the sliding member to downwardly press the slidingmember.

The sliding member is made of a hollow body, through which the drainpipe is slidably inserted, and is formed with a lateral slit, throughwhich the clamp member protrudes.

An outer peripheral surface of the drain pipe is formed with a recessedgroove, and the clamp member is fitted to the recessed groove; the clampmember has an arc-shaped portion which is positioned in the recessedgroove, and grip portions which are extended from both ends of thearc-shaped portion and are exposed outwardly from the lateral slit.

The fastening member includes a sliding member having an inclined washershoulder, in which the drain pipe is slidably inserted, a clamp washerwhich is brought into contact with the washer shoulder and is pivotallymoved m the sliding member, in which the drain pipe is fitted, and afirst spring member which is positioned between the basin and the clampwasher to downwardly presses the clamp washer, and the sliding member,in which the drain pipe is inserted in the vertical direction.

The fastening member includes a sliding member in which the drain pipeis slidably inserted, the sliding member having an inclined washershoulder, a pivot portion which is configured to receive a protrusion ofthe clamp washer seated on the washer shoulder so that the protrusion ispivotally moved, and a clearance hole which penetrates the slidingmember in a lateral direction at a position opposite to the pivotportion.

A lower end of the sliding member is connected to an upper end of anupper coupler; the upper coupler is made of a hollow body in which thedrain pipe can be inserted, and a lower end of the upper coupler isprovided with a connecting extension which is extended in a verticaldirection on the basis of the lower end; and a trapping cover is fittedto an upper portion of the connecting extension.

The trapping cover has a plate-shaped cover and a cover support which isextended downwardly from a bottom surface of the cover; and the coversupport is engaged to an outer peripheral surface of the upper end ofthe connecting extension to support the cover.

When the trapping cover is engaged to the connecting extension, a space,through which a fluid flows, is formed between the bottom surface of thecover and the upper portion of the connecting extension.

Advantageous Effects

With the above configuration, anyone can easily assemble or disassemblethe drain pipe assembly for installation of the basin according to thepresent invention, without using special tools, and it is possible toshorten the working time. In addition, if the trapping pipe isintegrally formed, it is possible to further reduce the number ofassembling steps.

DESCRIPTION OF DRAWINGS

FIGS. 1 and 2 are cross-sectional views illustrating a drain system fora washstand according to the related art.

FIG. 3 is a perspective view illustrating a drain pipe assembly forinstallation of a washstand according to the present invention.

FIG. 4 is an exploded perspective view illustrating the drain pipeassembly for installation of the washstand according to the presentinvention.

FIG. 5 is a cross-sectional view illustrating the drain pipe assemblyfor installation of the washstand according to the present invention.

FIG. 6 is a partially cross-sectional view of a fixing member of thedrain pipe assembly for installation of the washstand according to thepresent invention.

FIG. 7 is a view illustrating a state in which the drain pipe assemblyfor installation of the washstand according to the present invention isdisassembled from a basin.

FIG. 8 is a view illustrating a state in which the drain pipe assemblyfor installation of the washstand according to the present invention isassembled on the basin.

FIG. 9 is a cross-sectional view illustrating a drain pipe assembly forinstallation of the washstand according to a variant of the presentinvention.

FIG. 10 is a view illustrating a state in which a drain pipe of thedrain pipe assembly for installation of the washstand according to thevariant of present invention is released from a fastening member.

FIG. 11 is an enlarged cross-sectional view illustrating a fixing memberof the drain pipe assembly for installation of the washstand accordingto the variant of present invention.

FIG. 12 is a perspective view illustrating a drain pipe assembly forinstallation, of a washstand according to another embodiment of thepresent invention.

FIG. 13 is an exploded perspective view illustrating the drain pipeassembly for installation of the washstand according to anotherembodiment of the present invention.

FIG. 14 is a cross-sectional view illustrating the drain pipe assemblyfor installation of the washstand according to another embodiment of thepresent invention.

FIG. 15 is a perspective view illustrating a portion of a fasteningmember of the drain pipe assembly for installation of the washstandaccording to another embodiment of the present invention.

FIG. 16 is an enlarged cross-sectional view illustrating the fasteningmember of the drain pipe assembly for installation of the washstandaccording to another embodiment of the present invention.

FIG. 17 is a perspective view illustrating an operating state of thedrain pipe assembly for installation of the washstand according toanother embodiment of the present invention.

FIG. 18 is a cross-sectional view illustrating a state in which thedrain pipe assembly for installation of the washstand according toanother embodiment of the present invention is installed on a basin.

FIG. 19 is a cross-sectional view illustrating a drain pipe assembly forinstallation of the washstand according to further another embodiment ofthe present invention.

FIG. 20 is an exploded cross-sectional view illustrating the drain pipeassembly for installation of the washstand according to further anotherembodiment of the present invention.

FIG. 21 is a cross-sectional view of the circle A in FIG. 19.

FIG. 22 is a cross-sectional view of a variant of FIG. 21.

FIG. 23 is a cross-sectional view of the circle B in FIG. 19.

FIG. 24 is a cross-sectional view illustrating an operating example ofthe drain pipe assembly for installation of the washstand according tofurther another embodiment of the present invention.

FIG. 25 is a cross-sectional view illustrating an operating example ofthe drain pipe assembly for installation of the washstand including amodified sliding member according to further another embodiment of thepresent invention.

FIG. 26 is a cross-sectional view illustrating the drain pipe assemblyfor installation of the washstand including an interference-fitfastening member according to the present invention.

FIG. 27 is an enlarged cross-sectional view illustrating a couplingportion and a drain pipe in the drain pipe assembly for installation ofthe washstand according to the present invention in FIG. 26.

FIG. 28 is a perspective view illustrating a coupling portion of thedrain pipe assembly for installation of the washstand according to avariant of FIG. 26.

FIG. 29 is an enlarged cross-sectional view illustrating the couplingportion and a drain pipe in the drain pipe assembly for installation ofthe washstand according to a variant of FIG. 26.

FIG. 30 is an enlarged cross-sectional view illustrating a couplingportion and a drain pipe in a drain pipe assembly for installation of awashstand according to another variant of FIG. 26.

FIG. 31 is a front view illustrating the drain pipe assembly forinstallation of the washstand including a clamp fastening memberaccording to the present invention.

FIG. 32 is a front view of the drain pipe in FIG. 31.

FIG. 33 is a cross-sectional view taken along the line A-A in FIG. 32.

FIG. 34 is a diagram of a variant of FIG. 33.

FIG. 35 is a front view illustrating a sliding member of the drain pipeassembly in FIG. 31.

FIG. 36 is a cross-sectional view taken along a longitudinal directionof the sliding member in FIG. 35.

FIG. 37 is a plan view illustrating, the sliding member in FIG. 35.

FIG. 38 is a plan view illustrating a clamp member which is one exampleof the clamp fastening member according to the present invention.

FIG. 39 is a perspective view of a variant of FIG. 38.

FIG. 40 is a cross-sectional view illustrating a state in which thedrain pipe and the sliding member are coupled to each other by the clampmember of the drain pipe assembly for installation of the washstand inFIG. 31.

FIG. 41 is a partially cross-sectional view illustrating the couplingstate of the drain pipe and the sliding member in the drain pipeassembly for installation of the washstand in FIG. 36.

FIG. 42 is a cross-sectional view taken along a longitudinal directionof the sliding member in FIG. 41.

FIG. 43 is a plan view illustrating a clamp washer of the drain pipeassembly for installation of the washstand in FIG. 41.

FIG. 44 is a cross-sectional view of an upper coupling pipe in FIG. 31.

FIG. 45 is a perspective view of a trapping cover in FIG. 44.

FIG. 46 is a bottom view of the trapping cover.

MODE FOR INVENTION

The configuration of a drain pipe assembly for installation of awashstand according to embodiments of the present invention will behereafter described in detail with reference to the accompanyingdrawings.

FIG. 3 is a perspective view illustrating a drain pipe assembly forinstallation of a washstand according to the first embodiment. FIG. 4 isan exploded perspective view illustrating the drain pipe assembly forinstallation of the washstand according to the first embodiment. FIG. 5is a cross-sectional view illustrating the drain pipe assembly forinstallation of the washstand according to the first embodiment. FIG. 6is a partially cross-sectional view of a fixing member of the drain pipeassembly for installation of the washstand according to the firstembodiment. FIG. 7 is a view illustrating a state in which the fixingmember of the drain pipe assembly for installation of the washstandaccording to the first embodiment is released. FIG. 8 is a viewillustrating a state in which the drain pipe assembly for installationof the washstand according to the first embodiment is assembled on thebasin.

As illustrated in FIGS. 3 to 8, a drain pipe assembly 100 forinstallation of a washstand according to the first embodiment of thepresent invention includes a drain pipe 111 and a fastening member. Thefastening member is configured to press a bottom surface of a base of abasin 1 and pull downwardly a tubular body of a pipe extending to alower portion of a flange 113, and includes a sliding member 121, awasher 105, a first spring member 125, and a fixing member. Thefastening member resiliently presses the bottom surface of the base ofthe basin 1 in a longitudinal direction of the drain pipe 111, and pullsdownwardly the drain pipe 111, so that the drain pipe 111 is fixed tothe basin 1. In other words, the drain pipe 111 is fixed to the basin 1by the fastening member.

The drain pipe 111 is formed in an extended tubular shape, and has aflange 113 at an upper portion. The flange 113 is radially outwardlyextended from an upper end thereof when seen from the longitudinaldirection of the drain pipe 111, and thus is seated on a circumferenceof a drain port, formed in the basin to be flush with a top surface ofthe base of the basin 1. A lower end of the drain pipe 111 extendsdownwardly through the drain port formed in the basin 1. The drain pipe111 is installed to the basin 1 in such a way that the flange 113 iscaught by the drain port formed in the base of the basin 1 and extendsdownwardly through the drain port.

A recessed groove 111 a is formed on an outer peripheral surface of thedrain pipe 111. The recessed groove 111 a is located at a positiondownwardly away from the flange 113 so that it is exposed from a lowerportion of the basin 1 when the drain pipe 111 is inserted in the drainport. Pairs of recessed grooves 111 a may be provided which arevertically spaced apart from each other in the longitudinal direction ofthe drain pipe 111. A latch 123 which will be described hereinafter isinserted in the recessed groove 111 a.

The sliding member 121 is formed in a hollow tubular shape, and thedrain pipe 111 is inserted in the sliding member 121. The sliding member121 is inserted from the lower end of the drain pipe 111 so as to beslidably movable in the longitudinal direction of the drain pipe 111.The sliding member 121 has a tubular portion 1211 which is fitted ontothe drain pipe 111, a grip portion 1212 radially protruding from thetubular portion 1211, and a rotational support portion 1213 onto whichthe latch 123 is rotatably assembled. The grip portion 1212 is easilygripped by a hand of an installer when the sliding member 121 is slid.The grip portion 1212 is formed in an annular shape.

The inside of the tubular portion 1211 is provided with a seat portion1215 that is a shoulder portion inwardly protruding from the inside tosupport the lower end of a first spring member 125 which will bedescribed hereinafter. The side of the tubular portion 1211 is providedwith a groove portion 1214 to receive the latch 123. The tubular portion1211 may be extended downwardly beyond the grip portion 1212, so thatthe groove portion 1214 may be formed on the tubular portion 1211 at alower portion of the grip portion 1212.

The groove portion 1214 is, formed to penetrate the side of the tubularportion 1211. The seat portion 1215 protrudes inwardly to form ashoulder inwardly protruding from the tubular portion 1211, and thetubular portion 1211 has an inner diameter larger than an outer diameterof the drain pipe 121, so that the first spring member 125 is supportedby the seat portion 1215, with the first spring member being interposedbetween the outside of the drain pipe 111 and the inside of the tubularportion 1211. The inner surface of the seat portion 1215 has an innerdiameter larger than the outer diameter of the drain pipe 111. Thetubular portion 1211 is not limited to the circular cross section, andit is not necessary to make the cross section of the tubular portionwith a closed tube. If the tubular portion 1211 is made of a pipe, thegrip portion 1212 can be provided as a protrusion radially protrudingfrom the tubular portion 1211. The compression degree of the firstspring member 125 can be limited by the distance between the seatportion 1215 and the upper end of the tubular portion 1211.

The washer 105 is formed of a disc-type ring to receive the drain pipe111, and can slide in the longitudinal direction of the drain pipe 111.The washer 105 supports the bottom surface of the base of the basin 1,and the basin 1 is pressed and, fixed between the support portion 113and the washer 105. A packing 101 for preventing leakage is interposedbetween the support portion 113 and the top surface of the base of thebasin 1. The drain pipe 111 is inserted into the packing 101. Thepacking 101 may be interposed between the bottom surface of the base ofthe basin 1 and the washer 105.

The first spring member 125 is made of a coil spring, of which a lowerend is supported by the seat portion 1215 of the sliding member 121,while an upper end is supported by the washer 105. The upper end of thefirst spring member 125 can be brought into direct contact with thebottom surface of the base of the basin 1, without having washer 105.

The first spring member 125 resiliently presses the washer 105 againstthe bottom surface of the base of the basin 1, The fixing member isconfigured to fix the sliding member 121 to the drain pipe 111, andincludes the latch 123 and a second spring member 123 a.

The latch 123 is rotatably connected at one side to the rotationalsupport portion 1213 by a hinge shaft 1231 which is a pivot shaft. Therotational support portion 1213 is formed as a protrusion outwardlyprotruding from the sliding member 121, and is connected to a lowerportion of the grip portion 1212 and the outside of the tubular portion1211.

The latch 123 is rotatable around the hinge shaft 1231 with respect tothe sliding member 121, and an axial direction of the hinge shaft 1231is perpendicular to the longitudinal direction of the drain pipe 111. Itis preferable that a pair of latches 123 is provided at oppositepositions of the sliding member 121. The number of the latches can beincreased or decreased if necessary. The latch 123 is provided with aninclined point portion 1233 at a position spaced apart from the hingeshaft 1231 in a radius of rotation. The point portion 1233 is insertedin the recessed groove 11 a formed on the drain pipe 111, and thus thesliding member 121 is fixed to the drain pipe 111 in the longitudinaldirection thereof. The point portion 1233 moves beyond the grooveportion 1214 formed on the side of the tubular portion 1211, and then isinserted in the recessed groove 111 a. The groove portion 1214 is formedto have a cross section of which a top surface is inclined upwardly,while a bottom surface is horizontal or inclined upwardly. The pointportion 1233 is formed in such a way that a top surface is inclined in astate in which the point portion is inserted in the groove portion 1214.

The second spring member 123 a resiliently presses the latch 123 in arotation direction so that the latch 123 presses the drain pipe 111. Thesecond spring member 123 a is made of a torsion spring, and is engagedto the hinge shaft 1231 to press the latch 123 toward the drain pipe111. The second spring member 123 a has one extension which is broughtinto contact with the grip portion 1212, and the other extension whichis brought into contact with the latch 123.

The retracting direction of the latch 123 corresponds to a rotationdirection of the latch 123 by which the point portion 1233 of the latch123 presses the outer peripheral surface of the drain pipe 111. Thesecond spring member 123 a resiliently supports the latch 123 in thedirection to press the drain pipe 111. When the sliding member 121 isslid along the longitudinal direction of the drain pipe 111, if thelatch 123 arrives at the position opposite to the recessed groove 111 a,the latch 123 is inserted into the recessed groove 111 a by the pressingforce of the second spring member 123 a, and thus the sliding member 121is fixed to the drain pipe 111.

The lower end of the drain pipe 111 is coupled to the trapping pipe. Thetrapping pipe is to collect the water in a trap with a bent flow path,thereby preventing gases or bad smells from being flowing backward, oralien matters or bugs from coming in.

With the above-described configuration of the drain pipe assembly 100for installation of the washstand according to the first embodiment ofthe present invention, when the drain pipe assembly is installed to thebasin 1, the drain pipe 111 is first inserted into the drain port fromthe upward direction to the downward direction, and then the lower endof the drain pipe this fitted or screwed to the trapping pipe. Then, thesliding member 121 is upwardly slid until the latch 123 is caught by therecessed groove 111 a. When the latch 123 is caught by the recessed,groove 111 a, the second spring member 123 a presses the latch 123 inthe direction to insert the latch to the recessed groove 111 a. Andthus, the sliding member 121 is not further slid in the longitudinaldirection of the drain pipe 111, and is retained in a fixed state. Thefirst spring member 125 interposed between the sliding member 121 andthe washer 105 presses the washer 105 toward the support portion 113 ofthe drain pipe 111, that is, the upper portion, by the resilientlyrestoring force, so that the drain pipe 111 is completely fixed to thebasin 1.

On the contrary, when the drain pipe assembly 100 for installation ofthe washstand according to the first embodiment of the present inventionis disassembled from the basin 1, the latch 123 is rotated to spreadboth ends thereof, and the latch 123 is released from the recessedgroove 111 a. And then, the sliding member 121 is released from thedrain pipe 111 by the first spring member 125, and thus the drain pipe111 is in a free state from the basin 1. The lower end of the drain pipe111 is separated from the trapping pipe, and the drain pipe 111 isseparated from the drain port of the basin 1 from the downward directionto the upward direction.

FIG. 9 is a cross-sectional view illustrating a drain pipe assembly forinstallation of the washstand according to the second embodiment of thepresent invention. FIG. 10 is a view illustrating the state in which thedrain pipe of the drain pipe assembly for installation of the washstandaccording to the second embodiment of present invention is released froma fastening member. FIG. 11 is a view illustrating the state in which afixing member of the drain pipe assembly for installation of thewashstand according to the second embodiment of present invention ismounted to the basin. Comparing the second embodiment illustrated inFIGS. 9 to 11 and the first embodiment, the structure of the trappingpipe and the coupling structure between the drain pipe and the trappingpipe are different. Therefore, same reference numerals are used for thesimilar parts, and the description thereof will be omitted.

Referring to FIGS. 9 to 11, the drain pipe assembly 100 for installationof the washstand according to the second embodiment of present inventionincludes a drain pipe 111, a fastening/trapping module 7, a washer 105,a first spring member 125, a latch 123, and a second spring member 123a. The fastening/trapping module 7 has a sliding member 121 and atrapping pipe 131, and the sliding member 121 and the trapping pipe 131are integrally formed.

The drain pipe 111 is formed in an extended tubular shape, and has aflange 113 at an upper portion. The flange 113 is radially outwardlyextended from an upper end thereof when seen from the longitudinaldirection of the drain pipe 111, and thus is seated on a circumferenceof a drain port formed in the basin to be flush with a top surface ofthe base of the basin 1. A lower end of the drain pipe 111 is insertedinto the drain port formed in the basin 1, and is suspended from thebasin 1 by the support portion 113. A pair of recessed grooves is formedon an outer peripheral surface of the drain pipe 111. Pairs of recessedgrooves may be provided which are vertically spaced apart from eachother in the longitudinal direction of the drain pipe 111. A latch 123which will be described hereinafter is inserted in the recessed groove111 a.

The sliding member 121 is formed in a hollow tubular shape, and thedrain pipe 111 is inserted in the sliding member 121, so that thesliding member 121 is slidably movable in the longitudinal direction ofthe drain pipe 111.

The washer 105 is formed of a disc-type ring to receive the drain pipe111, and can slide in the longitudinal direction of the drain pipe 111.The washer 105 supports the bottom surface of the base of the basin 1,and the basin 1 is retained between the support portion 113 and thewasher 105. The first spring member 125 is made of a compressed coilspring, of which a lower end is supported by the sliding member 121,while an upper end is supported by the washer 105. The first springmember 125 resiliently presses the washer 105 against the bottom surfaceof the base of the basin 1.

The latch 123 is rotatably connected at one side to the sliding member121. The latch 123 is rotatable around the hinge shaft with respect tothe sliding member 121, and an axial direction of the hinge shaft isperpendicular to the longitudinal direction of the drain pipe 111. Thesecond spring member 123 a resiliently presses the latch 123 in arotation direction so that the latch 123 presses the drain pipe 111. Thesecond spring member 123 a has the same configuration as theabove-described embodiment and thus the detailed description will beomitted hereinafter.

The trapping pipe 131 is formed integrally with the lower portion of thesliding member 121. The trapping pipe 131 is formed in a straight shapein the longitudinal direction thereof, and has a first partition 1311and a second partition 1312 therein. The first partition 1311 isdownwardly extended at an angle from the upper portion, while the secondpartition 1312 is upwardly extended at an angle from a lower portion.The inclined directions of the first partition 1311 and the secondpartition 1312 are parallel with each other. The water is collected by atrapping flow path which is formed between the first partition 1311 andthe second partition 1312. Specifically, with the configuration of thefirst partition 1311 and the second partition 1312, the inside of thetrapping pipe 131 is provided with a U-shaped bent flow path. The bentflow path provides the trapping flow path to collect the water therein,thereby preventing gases or bad smells from being flowing backward, oralien matters or bugs from coming in.

Since the trapping pipe 131 is formed integrally with the sliding member121, it is possible to reduce the number of assembling processes. Inaddition, the space occupied by the trapping pipe can be reduced by thestraight structure of the trapping pipe 131 and the structure of thetrapping flow path which is formed in the trapping pipe 131, and thetrapping pipe 131 can be easily assembled or disassembled.

With the above-described configuration of the drain pipe assembly 100for installation of the washstand according to the second embodiment ofthe present invention, when the drain pipe assembly is installed to thebasin 1, the drain pipe 111 is first inserted into the drain port of thebasin 1 from, the upward direction to the downward direction, and thenthe fastening/trapping module 7, of which the sliding member 121 and thetrapping pipe 131 are integrally formed, is upwardly slid until thelatch 123 is caught by the recessed groove 111 a. When the latch 123 iscaught by the recessed groove, the second spring member 123 a pressesthe latch 123 in the direction to insert the latch 123 to the recessedgroove 111 a. And thus, the fastening/trapping module 7 is not furtherslid in the longitudinal direction of the drain pipe 111, and isretained in a fixed state. The first spring member 125 interposedbetween the sliding member 121 and the washer 105 presses the washer 105toward the support portion 113 of the drain pipe 111, that is, the upperportion, by the resiliently restoring force, so that the drain pipe 111is completely fixed to the basin 1.

On the contrary, when the drain pipe assembly 100 for installation ofthe washstand according to the second embodiment of the presentinvention is disassembled from the basin 1, the latch 123 is rotated tospread both ends thereof, and the latch 123 is released from therecessed groove 111 a. And then, the fastening/trapping module 7 isreleased from the drain pipe 111 by the first spring member 125, andthus the drain pipe 111 is in a free state from the basin 1. The drainpipe 111 is separated from the drain port of the basin 1 from thedownward direction to the upward direction.

FIG. 12 is a perspective view illustrating a drain pipe assembly forinstallation of a washstand according to the third embodiment. FIG. 13is an exploded perspective view illustrating the drain pipe assembly forinstallation of the washstand according to the third embodiment, FIG. 14is a cross-sectional view illustrating the drain pipe assembly forinstallation of the washstand according to the third embodiment. FIG. 15is a perspective view illustrating a portion of a fastening member ofthe drain pipe assembly for installation of the washstand according tothird embodiment. FIG. 16 is an enlarged cross-sectional viewillustrating the fastening member of the drain pipe assembly forinstallation of the washstand according to third embodiment. FIG. 17 isa perspective view illustrating an operating state of the drain pipeassembly for installation of the washstand according to the thirdembodiment. FIG. 18 is a cross-sectional view illustrating a state inwhich the drain pipe assembly for installation of the washstandaccording to the third embodiment is installed on the basin.

As illustrated in FIGS. 12 to 18, the drain pipe assembly 100 forinstallation of the washstand according to the third embodiment of thepresent invention includes a drain pipe 111 and a fastening member.

The fastening member is configured to fix the basin 1 between flanges113, and includes a sliding member 121, a handle 122, and an urgingpart. The fastening member resiliently presses the side of the drainpipe 111 to fasten the basin 1 and the drain pipe 111 together.Specifically, the drain pipe 111 is fastened to or unfastened from thebasin 1 by the fastening member. The fastening operation and theunfastening operation are easily carried out by a one-touch manner.Hereinafter, the one-touch structure and operation of the fasteningmember will be described in detail.

The drain pipe 111 is formed in an extended tubular shape, and has aflange 113 at an upper portion. The flange 113 is radially outwardlyextended from an upper end thereof when seen from the longitudinaldirection of the drain pipe 111, and thus is seated on a top surface ofthe base of the basin 1. The drain pipe 111 is inserted in a drain portformed in the base of the basin 1, and is seated on the flange 113, sothat the drain pipe 111 penetrates the through-hole of the basin 1. Thedrain pipe 111 is inserted in the through-hole from the upper portion,and is exposed downwardly from the lower portion of the basin 1.Recessed grooves 111 a are formed on an outer peripheral surface of thedrain pipe 111 at a location lower than the flange 113.

The recessed grooves 111 a are located at a position downwardly awayfrom the flange 113 in the longitudinal direction of the drain pipe 111.Several recessed grooves 111 a may be provided which are verticallyspaced apart from each other in the longitudinal direction of the drainpipe 111. The recessed grooves 111 a may be, formed on the outerperipheral surface of the drain pipe in, a circumferential direction.

A lower end of a second link member 124 b which will be described below,i.e., a bent portion 1243 b, is inserted in the recessed groove 111 a.The recessed groove 111 a is formed in such a way that an upper portionis inclined in an extension direction of the lower end of a second linkmember 124 b, i.e., the bent portion 1243 b, and a lower portion extendsin a horizontal direction. Preferably, the upper portion of the recessedgroove 111 a is formed to have the same inclined angle as an angle ofthe bent portion 1243 b of the second link member 12411. With the aboveconfiguration, when the bent portion 1243 b comes out from the recessedgroove 111 a, the bent portion 1243 b is smoothly slid from the recessedgroove 111 a along the inclined surface of the upper portion of therecessed groove 111 a. When the bent portion 1243 b is inserted in therecessed groove 111 a, the bent portion 1243 b is caught by thehorizontal surface of the lower portion of the recessed groove 111 a,and thus the sliding member 121 is firmly fixed to the drain pipe 111.

The sliding member 121 is formed in a hollow tubular shape, and thedrain pipe 111 is inserted in the sliding member 121. The sliding member121 has a tubular portion 1211 which is fitted onto the drain pipe 111,a flange 1212 radially outwardly extended from an upper end thereof tosupport a bottom surface of the base of the basin 1, a rotationalsupport portion 1213 to be assembled to a handle 122 which will bedescribed later, and a guide portion 1216.

A ring-shaped packing 101 made of rubber or the like to serve as asealing is respectively interposed between the top surface of the baseof the basin 1 and the flange 113 of the dram pipe 111, and between thebottom surface of the base of the basin 1 and the flange 113 of thesliding member 121. The flange 1212 supports a bottom surface of thepacking 101, and is easily held by a hand of an installer when thesliding member 121 slides. The side of the tubular portion 1211 isformed with a groove portion 1214 below the flange 1212, and a lower endof the second link member 124 b is inserted in the groove portion 1214.The lower end of the second link member 124 b communicates with the sideof the drain pipe 111 through the groove portion 1214. The guide portion1216 is a slot vertically extending along the outer peripheral surfaceof the sliding member 121. The second link member 124 b is inserted inthe slot vertically formed between the guide portion 1216 and thetubular portion 1211, and thus is guided to be slidably moved in avertical direction. The guide portion 1216 is formed to have an almostC-shaped cross section, and is provided on the outer peripheral portionof the tubular portion 1211 to vertically communicate the space betweenthe tubular portion 1211 and the guide portion 1216.

The sliding member 121 may not be formed with the groove portion 1214,and the sliding member 121 may be shortened so that the lower end of thesecond link member 124 b is positioned below the lower end of thesliding member 121.

The handle 122 is formed in a bar shape, and has an upper end which isrotated by a hinge shaft 1223 toward the outside of the sliding member121. The handle 122 is rotatably connected to the hinge shaft 1223 whichis a pivot shaft of the rotational support portion 1213, and therotational support portion 1213 is a bracket provided at a lower portionof the flange 1212. The handle 122 can be rotatably connected to theflange 1212.

The handle 122 is rotatable around the hinge shaft 1223 with respect tothe sliding member 121, and an axial direction of the hinge shaft 1223is perpendicular to the longitudinal direction of the drain pipe 111. Itis preferable that a pair of handles 122 is provided at oppositepositions of the sliding member 121. The number of the handles can beincreased or decreased if necessary. The handle 122 extends towards aradius of rotation on the basis of the hinge shaft 1223. The handle 122should be extended to have a sufficient length so as to transfer astrong force by a leverage effect even by relative less force when theinstaller rotates the handle 122 by his or her hand.

The urging member is to compress or depress the side of the drain pipe111 by the rotation of the handle 122, and has a first link member 124a, the second link member 124 b, and a spring member 125 a. The firstlink member 124 a has an upper end rotatably connected to the handle122, and a lower end formed with a locking groove 1242 a. The upper endof the first link member 124 a has pivot shafts 1241 a protruding fromboth sides thereof, and the handle 122 is rotatably connected to thepivot shaft. The handle 122 has a C-shaped cross section, and is formedwith through-holes to receive the pivot shaft 1241 a. The upper end ofthe first, link member 124 a is rotatably connected to a position spacedapart from the hinge shaft 1223 in the longitudinal direction of thehandle 122. The pivot shaft 1241 a may be provided in a separate way,and the upper end of the first link member 124 a may be formed withinsertion holes, so that the pivot shaft 1241 a can be inserted in thehandle 122 and the first link member 124 a, thereby connecting the firstlink member 124 a to the handle 122 in a rotatable manner.

The second link member 124 b has an upper portion connected to thelocking groove 1242 a, and a lower portion extending toward the side ofthe drain pipe 111. The upper end of the second link member 124 b isprovided with a hook portion 1241 b, and the hook portion 1241 b isinserted and engaged to the locking groove 1242 a of the first linkmember 124 a. A portion of the lower end of the second link member 124 bhas a bent portion 1243 b radially inwardly inclined toward the side ofthe drain pipe 111. The hook portion 1241 b is loosely inserted in thelocking groove 1242 a in such a way that it is movable in a verticaldirection. Since the hook portion 1241 b is loosely inserted in thelocking groove 1242 a, the clearance of the recessed groove 111 a can beincreased. Alternatively, the dimension of the urging force can beadjusted by changing the size of the locking groove 1242 a to regulatethe clearance.

The bent portion 1243 b is inserted in the groove portion 1214 formed inthe sliding member 121, and extends toward the side of the drain pipe111. The outer surface of the second link member 124 b is provided witha pair of engaging pieces 1242 b spaced apart from each other in avertical direction to support the spring member 125 a which will bedescribed later. Upper and lower bent ends of the spring member 125 aare inserted in the engaging pieces 1242 b.

The lower end of the bent portion 1243 b of the second link member 124 bis inserted in the groove portion 1214, and the bent portion thereof iscaught by the upper end of the groove portion 1214 of the sliding member121, and thus is resilient deformed in a direction to decompress thedrain pipe 111. The decompressing direction of the bent portion 1243 bmeans a direction inclined from its original inclined angle, which is,prior to resilient deformation, to the radial outside of the drain pipe111.

The spring member 125 a is interposed between the second link member 124b and the guide portion 1216, and is made in the shape of a leaf spring,of which one side is supported between the engaging pieces 1242 b of thesecond link member 124 b. The other side of the spring member 125 a isclose to the inner wall of the guide portion 1216 to resiliently urgethe second link member 124 b toward the drain pipe 111.

If the handle 122 rotates around the hinge shaft 1223 to the outside ofthe sliding member 121 (counterclockwise direction in FIG. 16), thefirst link member 124 a connected to the handle 122 to be rotatablearound the pivot shaft 1241 a is moved in the upward direction. Thesecond link member 124 b connected to the first link member 124 a ispulled upwardly by the hook portion 1241 b, and then is moved in theupward direction. If the second link member 124 b is moved in the upwarddirection, the bent portion 1243 b is slid along the lower end of thesliding member 121, and then is radially outwardly moved, in the casewhere the upper end of the groove portion 1214 is not formed with thegroove portion 1241, and the second link member 124 b is extended to thelower end of the sliding member 121. As a result, the end of the bentportion 1243 b comes out from the recessed groove 111 a of the drainpipe 111. Therefore, the sliding member 121 can be freely slid in thelongitudinal direction of the drain pipe 111.

On the contrary, if the handle 122 rotates around the hinge shaft 1223to the inside of the sliding member 121 (clockwise direction in FIG.16), the first link member 124 a connected to the handle 122 to berotatable around the pivot shaft 1241 a is moved in the downwarddirection. The second link member 124 b connected to the first linkmember 124 a is urged downwardly by the first link member 124 a, andthen is guided and moved in the downward direction by the guide portion1216. If the second link member 124 b is moved in the downwarddirection, the bent portion 1243 b is released from the upper end of thegroove portion 1214, and then the end of the bent portion 1243 b isinserted in the recessed groove 111 a of the drain pipe 111 by theresilient restoration. In this instance, the spring member 125 acontinuously resiliently urges the second link member 124 b in adirection to insert the bent portion 1243 b to the recessed groove 111a. As a result, the sliding member 121 is restricted in the longitudinaldirection of the drain pipe 111, and thus the sliding movement islimited. The sliding member 121 is urged in the upward direction by theresiliently urging force of the first link member 124 a and the secondlink, member 124 b.

While not illustrated in the drawings, the lower end of the drain pipe111 is coupled to the trapping pipe. The trapping pipe is to collect thewater in a trap with a bent flow path, thereby preventing gases or badsmells from being flowing backward, or alien matters or bugs from comingin.

Explaining the assembling process of the drain pipe assembly 100 forinstallation of the washstand according to the first embodiment of thepresent invention, the drain pipe 111 is first inserted into the drainport formed in the base of the basin 1 from the upward direction to thedownward direction. The sliding member 121 is inserted in the drain pipe111 which is inserted in the drain port and thus is exposed below thebasin 1.

Then, the lower end of the drain pipe 111 is fitted or screwed to thetrapping pipe. In the state in which the handle 122 is rotated in theopen direction (counterclockwise direction in FIG. 16), the slidingmember 121 is upwardly slid, and thus the packing 101 is brought intoclose contact with the bottom surface of the base of the basin 1, whilethe basin 1 is positioned between the flange 113 of the sliding member121 and the flange 1212 of the drain pipe 111. If there is no packing101, the basin 1 is brought into close contact with the flange 113 ofthe sliding member 121 and the flange 1212 of the drain pipe 111.

In this instance, the pivot shaft 1241 a is located at the positionouter than the hinge shaft 1223 a when seen from radial direction. Ifthe handle 122 is rotated in a close direction (clockwise direction inFIG. 16), the first link member 124 a and the second link member 124 bare moved in the downward direction, and the bent portion 1243 b of thesecond link member 124 b is slid in the state in which it is broughtinto contact with the upper end of the groove portion 1214. Since thespring member 125 a urges the second link member 124 b toward the drainpipe Ill, the second link member 124 b is moved in the downwarddirection, and the lower end of the bent portion 1243 b is inserted inthe recessed groove 111 a. If the handle 122 is continuously rotated inthe state in which the lower end of the bent portion 1243 b is insertedin the recessed groove 111 a, a compressive load is generated in thefirst link member 124 a and the second link member 124 b. Accordingly,the upward load is applied to the sliding member 121, and thus the basin1 is pressed between the flange 113 of the drain pipe 111 and the flange1212 of the sliding member 121 so as to be firmly fixed therebetween. Ifthe pivot shaft 1241 a is located at the position inner than the hingeshaft 1223 in the radial direction by continuously rotating the handle122, the assembling process is completed, and the assembled state ismaintained as long as an external force is not applied to the handle122.

The first link member 124 a and the second link 124 b can be formed inone unit, of which an upper end is rotatably connected to the handle 77,and a lower end has the bent portion 1243 b.

The lower end of the bent portion 1243 b of the second link member 124 bis inserted in the recessed groove of the drain pipe 111. The slidingmember 121 is fixed to the drain pipe 111 to support the bottom surfaceof the base of the basin 1 in a contact state, and the assemblingprocess is completed.

On the contrary, when the drain pipe assembly 100 for installation ofthe washstand according to the third embodiment of the present inventionis disassembled from the basin 1, the sliding member 121 is releasedfrom the drain pipe 111 by rotating the handle 122 in the opendirection. Thus, the sliding member 121 can be freely slid from thedrain pipe 111, and, the state of supporting the bottom surface of thebase of the basin 1 in the contact state is released. In this instance,the drain pipe 111 is separated from the trapping pipe, and is taken outfrom the drain port formed in the base of the basin 1 in the upwarddirection, thereby completing the disassembling process.

FIG. 19 is a cross-sectional view illustrating a drain pipe assembly forinstallation of the washstand according to the fourth embodiment of thepresent invention. FIG. 20 is an exploded cross-sectional viewillustrating the drain pipe assembly for installation of the washstandaccording to the fourth embodiment FIG. 21 is an enlargedcross-sectional view of the circle A in FIG. 19. FIG. 22 is across-sectional view of a variation of FIG. 21. FIG. 23 is an enlargedcross-sectional view of the circle B in FIG. 19. FIG. 24 is across-sectional view illustrating an operating example of the drain pipeassembly for installation of the washstand according to the fourthembodiment. FIG. 25 is a cross-sectional view illustrating an operatingexample of the drain pipe assembly for installation of the washstandincluding a modified sliding member according to the fourth embodiment.

Hereinafter, the longitudinal direction of the drain pipe 111 which is avertical direction of FIG. 19 is referred to as a longitudinaldirection, while a horizontal direction is referred to as a widthwisedirection.

As illustrated in FIGS. 19 to 21, the drain pipe assembly forinstallation of the washstand according to the fourth embodimentincludes a drain pipe 111 and a fastening member.

The drain pipe 111 is formed in an extended tubular shape, and has aflange 113 at an upper portion. The flange 113 is radially outwardlyextended from an upper end thereof when seen from the longitudinaldirection of the drain pipe 111, and thus is seated on a circumferenceof a drain port 1 a formed in the basin to be flush with a top surfaceof the base of the basin 1. A lower end of the drain pipe 111 extendsdownwardly through the drain port formed in the basin 1. The drain pipe111 is installed to the drain port 1 a formed in the base of the basin 1in such a way that the flange 113 is caught by an upper portion of thedrain port 1 a to maintain the state in which the drain pipe 111 isinserted in the drain port 1 a. A recessed groove 111 a is formed on anouter peripheral surface of the drain pipe 111 which is exposed belowthe basin 1.

The recessed groove 111 a is configured to, receive a ball member 5inwardly protruding through a through-hole 121 a which will be describedlater. A plurality of recessed grooves 111 a which are vertically spacedapart from each other in the longitudinal direction of the drain pipe111 are formed on the outer peripheral surface of the drain pipe 111 ina circumferential direction of the drain pipe. The recessed grooves 111a of a concave shape may be formed on the entire outer peripheralsurface of the drain pipe 111 in the circumferential direction. Rows ofrecessed grooves 111 a may be formed which are vertically spaced apartfrom each other in the longitudinal direction of the drain pipe 111.

FIG. 22 is a cross-sectional view of the variation of FIG. 21. Therecessed groove 111 a is a groove inwardly recessed from the outerperipheral surface of the drain pipe 111, as illustrated in FIG. 21, butmay be a groove inwardly depressed from the drain pipe 111 by forming abent portion 111 c, as illustrated in FIG. 22.

The fastening member is configured to fix the drain pipe 111 to thebasin 1, and includes a sliding member 121, an pressing member 127, afirst spring member 125, and a fixing part.

The fastening member resiliently presses the side of the drain pipe 111,and also resiliently presses the bottom surface of the base of the basin1 in an upward direction with respect to the longitudinal direction ofthe drain pipe 111, thereby applying a downward load to the drain pipe111 and thus engaging the drain pipe 111 to the basin 1.

The sliding member 121 is formed in a hollow tubular shape, and theportion of the drain pipe 111 which is exposed below the basin 1 isslidably inserted in the sliding member 121. The sliding member 121 isupwardly inserted from the lower end of the drain pipe 111.

The sliding member 121 is provided on the side thereof with a pluralityof through-holes 121 a in which a ball member 5 is positioned. Thethrough-hole 121 a penetrates the wall of the sliding member 121. Aplurality of through-holes 121 a are formed in a circumferentialdirection and are spaced apart from each other in the longitudinaldirection.

As illustrated in FIG. 23, an O-ring 55 is interposed between thesliding member 121 and the drain pipe 111 for the purpose of sealing.Specifically, the O-ring 55 is interposed between the outside of thedrain pipe 111 and the inside of the sliding member 121.

The O-ring 55 is positioned below the through-hole 121 a in thelongitudinal direction. The sliding member 121 and/or the drain pipe 111may be formed with a groove for receiving the O-ring 55.

The sliding member 121 is provided with a seating boss 121 b outwardlyprotruding the outer peripheral surface. The seating boss 121 bprotrudes from a position below the through-hole 121 a in thelongitudinal direction.

The pressing member 127 is configured to support the bottom surface ofthe base of the basin 1, and the drain pipe 111 is fitted into thepressing member 127 in such a way that the pressing member 127 isslidably moved along the drain pipe 111. The portion 111 of the drainpipe 111 which is exposed below the basin 1 is fitted into the pressingmember 127. The pressing member 127 is formed with a receiving portion1271 with a bottom being opened, and the first spring member 125 isinstalled in the receiving portion 1271. The pressing member 127 may nothave the receiving portion 1271, but may have a protrusion outwardlyprotruding, like a flange. Hereinafter, the receiving portion 1271 orthe protrusion, which is brought into contact with the upper end of thefirst spring member 125, provided on the pressing member 127 is referredto as an upper support portion.

The pressing member 127 is positioned between the basin 1 and thesliding member 121.

A ring-shaped packing 101 made of rubber or the like is interposedbetween the flange portion 113 of the drain pipe 111 and the top surfaceof the base of the basin 1, and between the pressing member 127 and thebottom surface of the base of the basin 1 for the purpose of sealing.The drain pipe 111 is inserted into the packing 101.

The pressing member 127 is urged upwardly by the first spring member125.

The first spring member 125 is interposed between the sliding member 121and the pressing, member 127 in the longitudinal direction, and thus ispressed from both sides. The lower portion is brought into contact withthe sliding member 121 and is supported by the sliding member, while theupper portion is brought into contact with the pressing member 127 andis supported by the pressing member. The first spring member 125 may bea coil spring.

The first spring member 125 presses the pressing member 127 against thebottom surface of the base of the basin 1. The upper portion of thefirst spring member 125 is brought into contact with the upper supportportion of the pressing member 127 by inserting the first spring memberin the receiving portion or bringing it into contact with theprotrusion, and is supported by the upper support portion. The lowerportion is brought into contact with the upper end of the sliding member121, and is supported by the upper end.

When the sliding member 121 is fixed to the drain pipe 111, the firstspring member 125 resiliently presses the pressing member 127 in theupward direction, so that the drain pipe 111 is coupled to the basin 1.

The fixing member is configured to fix the sliding member 121 to thedrain pipe 111, and has a locking member 128, a second spring member 123b, and a ball member 5.

The locking member 128 is slidably moved along the outer peripheralsurface of the sliding member 121 in the longitudinal direction. Thesliding member 121 is moved and positioned in the locking member 128.

The locking member 128 has a body with upper and lower opened portions,and the lower portion is provided with a stopper boss 1282 protrudingtoward the sliding member 121. The stopper boss 1282 protrudes inwardlyfrom the locking member 128 in the widthwise direction, and is locked tothe seating boss 121 b formed on the sliding member 121, therebyrestricting the sliding distance of the locking member in the upwarddirection. The stopper boss 1282 has an inner end positioned inner thanan outer end of the seating boss 121 b in the widthwise direction.

The locking member 128 is provided with a pressing boss 1281. Thepressing boss 1281 protrudes inwardly from the inside of the lockingmember 128 in the widthwise direction, and is positioned above from thestopper boss 1282 in the longitudinal direction. The pressing boss 1281is positioned below the upper end of the locking member 128 in thelongitudinal direction. The pressing boss 1281 has a top surface taperedtoward the ball member 5. The inner surface of the upper portion of thelocking member 128 which corresponds to the upper portion of thepressing boss 1281 is formed to be outer than the pressing boss 1281 inthe widthwise direction. Therefore, if the upper portion of the lockingmember is positioned on the ball member 5, the ball member 5 is notpressed in the inward direction. If the locking member 128 is formed ina cylindrical shape, the locking member has an inner diameter largerthan that of the pressing boss 1281.

When the upper end of the stopper boss 1282 is brought into contact withthe lower end of the seating boss 121 b, the pressing boss 1281 ispositioned against the ball member 5.

When the pressing boss 1281 is positioned against the ball member 5, thepressing boss 1281 is brought, into contact with the ball member 5, sothat the ball member 5 positioned in the through-hole 121 a is pressedinwardly (toward the drain pipe 111) by the pressing boss 1281 in thewidthwise direction. If the upper portion of the locking member ispositioned on the ball member 5 by moving the locking member 128 down,the ball member 5 is not pressed inwardly. The inner end of the pressingboss 1281 is formed to be outer than the outer surface of the slidingmember 121.

The ball member 5 is positioned in the through-hole 121 a. If the ballmember 5 is pressed inwardly by the pressing boss 1281 in the widthwisedirection, the ball member is exposed to the drain pipe 111 through thethrough-hole 121, thereby pressing the drain pipe 111.

When the ball member 5 is brought into contact with the inner end of therecessed groove 111 a, the widthwise distance from the inner end of therecessed groove 111 a of the drain pipe 111 to the inner end of thepressing boss 1281 is equal to or larger than the diameter of the ballmember 5, and the widthwise distance from the outer surface of the drainpipe 111 to, the inner end of the pressing boss 1281 is smaller than thediameter of the ball member 5. Accordingly, when the pressing boss 1281is positioned against the ball member 5, the ball member 5 is insertedin the recessed groove 111 a. Meanwhile, the widthwise distance from theouter surface of the drain pipe 111 to the inner surface of the upperportion of the locking member is larger than the diameter of the ballmember 5, and the widthwise distance from the outer surface of thesliding member 121 to the inner surface of the upper portion of thelocking member is smaller than the diameter of the ball member 5.Accordingly, when the upper portion of the locking member is positionedon the ball member 5, the sliding, member 121 can be slid while the ballmember 5 is not released.

The seating boss 121 b of the sliding member 121 is positioned betweenthe pressing boss 1281 and the stopper boss 1282, and the siding member121 is inserted in the second spring member 123 b, so that the secondspring member 123 b is interposed between the pressing boss 1281 and theseating boss 121 b. The second spring member 123 b may be a coil spring.

If the sliding member 121 and the locking member 128 are made of a pipehaving a circular cross section, the inner diameter of the pressing boss1281 is larger than the outer diameter of the sliding member 121. Theouter diameter of the seating boss 121 b is larger than the innerdiameter of the stopper boss 1282. The second spring member 123 b ispositioned between the seating boss 121 b and the pressing boss 1281 inthe longitudinal direction, and is inserted in the cylindrical spaceformed between the sliding member 121 and the locking member 128.

The second spring member 123 b is positioned between the seating boss121 b and the pressing boss 1281, and presses the seating boss 121 b andthe pressing boss 1281 in a direction to be away from each other. Thelocking member 128 is upwardly pressed by the second spring member 123b.

When the external force is not applied to the locking member 128, thelocking member 128 is upwardly pressed by the second spring member 123b, and the stopper boss 1282 is brought into contact with the seatingboss 121 b. The pressing boss 1281 is positioned against the ball member5, and the ball member 5 is inwardly pressed by the pressing boss 1281in the widthwise direction. Since the ball member 5 protrudes inwardlythrough the through-hole 121 a, if the ball member 5 is positioned inthe recessed groove 111 a by moving the sliding member 121 in thevertical direction, so that the sliding member 121 is fixed to the drainpipe 111.

In this instance, the first spring member 125 positioned between thepressing member 127 and the sliding member 121 is compressed, and thusthe pressing member 127 is upwardly pressed. Accordingly, the basin 1 ispressed between and by the flange 113 and the pressing member 127, andthus the drain pipe 111 is fixed to the basin 1.

The lower end of the drain pipe 111 is coupled to the trapping pipe 131.The trapping pipe 131 is to collect the water in a trap with a bent flowpath, thereby preventing gases or bad smells from being flowingbackward, or alien matters or bugs from coming in. The O-ring 55 isinterposed between the sliding member 121 and the trapping pipe 131 forthe purpose of sealing.

With the above-described configuration of the drain pipe assembly 100for installation of the washstand according to the fourth embodiment,when the drain pipe assembly is installed to the basin 1, the drain pipe111 is first inserted into the drain port 1 a formed in the base of thebasin 1 from the upward direction to the downward direction. In thisinstance, the packing 101 can be fitted to the drain pipe 111 to bepositioned at the lower portion of the flange 113, and then the drainpipe 111 can be inserted in the drain port 1 a of the base of the basin1.

In the state in which the drain pipe 111 is inserted in the drain port 1a, the pressing member 127 and the first spring member 125 aresequentially fitted to the lower portion of the drain pipe 111 which is,exposed below the basin 1. And then, the module, in which the slidingmember 121, the locking member 128, the second spring member 123 b, andthe ball member 5 are assembled, is fitted to the drain pipe 111 to bepositioned below the pressing member 127. Before the pressing member 127is fitted, another packing 101 can be first fitted so that the packing101 is provided on the pressing member 127.

If the upper portion of the locking member 128 is positioned on the ballmember 5 by pulling the locking member 128 down, as illustrated in FIG.24, the ball member 5 is freely moved in the widthwise direction, andthus the sliding member 121 is freely slid from the drain pipe 111. Inthis instance, the lower end of the sliding member 121 is inserted inthe trapping pipe 131. Then, if the pulling state of the locking member128 is released, the locking member 128 is moved up by the restoringforce of the second spring member 123 b, and thus the ball member 5 ispressed. If the sliding member 121 is moved along the drain pipe 111 inthe vertical direction in the state in which the ball member 5 ispressed, the ball member 5 is positioned in the recessed groove 111 a,thereby completing the fastening process.

The lower end of the sliding member 121 of the module, in which thesliding member 121, the locking member 128, the second spring member 123b, and the ball member 5 are assembled, is fitted to the trapping pipe131, and then the first spring member 125 and the pressing member 127are positioned on the sliding member 121. The pressing member 127, thefirst spring member 125, the sliding member 121, the locking member 128,the second spring member 123 b, and the ball member 5 are positionedbelow the basin 1. In this instance, the packing 101 may be positionedon the basin 1, or on the basin 1 and the pressing member 128. The drainpipe 111 can be inserted in the pressing member 128 and the slidingmember 121 from the upper portion of the drain port 1 a to the lowerportion. When the drain pipe 111 is inserted, the ball member 5 ispositioned in the recessed groove 111 a, thereby completing thefastening process.

On the contrary, when the drain pipe assembly 100 for installation ofthe washstand according to the fourth embodiment is disassembled fromthe basin 1, the upper portion of the locking member 128 is releasedfrom the pressing state of the ball member 5 by pulling the lockingmember 128 down. In this instance, the drain pipe 111 is moved upwardlyto separate from the drain port 1 a formed in the base of the basin 1,thereby completing the disassembling process.

Alternatively, after the sliding member 121 is separated from thetrapping pipe 131, and the upper portion of the locking member 128 isreleased from the pressing state of the ball member 5 by pulling thelocking member 128 down, the module, in which the sliding member 121,the locking member 128, the second spring member 123 b, and the ballmember 5 are assembled, is separated from the lower end of the drainpipe 111, thereby completing the disassembling process.

Meanwhile, FIG. 25 is a cross-sectional view illustrating an operatingexample of the drain pipe assembly for installation of the washstandaccording to a variation of the present invention. The drain pipeassembly in FIG. 25 is substantially similar to that according to thefourth embodiment, except for a corrugated extension, and thus the sameconfiguration thereof will be not described.

Referring to FIG. 25, the lower end of the sliding member 121 isconnected to the trapping pipe 131 via an extension 1217. The extension1217 is provided to the sliding member 121 and the trapping pipe 131.

The extension 1217 is made of a flexible material, such as a corrugatedpipe, at the lower portion of the sliding member 121, so as to contractor retract in the longitudinal direction. Accordingly, when the drainpipe assembly is disassembled, the sliding member 121 is not detachedfrom the trapping pipe 131, but the extension 1217 is contracted orretracted, thereby easily lowering and separating the module, in whichthe sliding member 121, the locking member 128, the second spring member123 b, and the ball member 5 are assembled, from the drain pipe 111.

After the sliding member 121 is inserted in the extension 1217, theextension 1217 can be coupled to the sliding member 121 by tighteningthe outer surface of the extension. The extension 1217 can serve as atrapping pipe by bending a portion thereof, without using the separatetrapping pipe 131.

FIG. 26 is a cross-sectional view illustrating the drain pipe assemblyfor installation of the washstand including an interference-fitfastening member according to the fifth embodiment of the presentinvention. FIG. 27 is an enlarged cross-sectional view illustrating acoupling portion and a drain pipe in the drain pipe assembly forinstallation of the washstand according to the fifth embodiment in FIG.26. FIG. 28 is a perspective view illustrating a coupling portion of thedrain pipe assembly for installation of the washstand according to avariation of FIG. 26. FIG. 29 is an enlarged cross-sectional viewillustrating the coupling portion and a drain pipe in the drain pipeassembly for installation of the washstand according to the variation ofFIG. 26. FIG. 30 is an enlarged cross-sectional view illustrating thecoupling portion and the drain pipe in the drain pipe assembly forinstallation of the washstand according to another variation of FIG. 26.

Hereinafter, the vertical direction in FIG. 2 is referred to as alongitudinal direction.

As illustrated in FIGS. 26 and 27, the drain pipe assembly forinstallation of the washstand including an interference-fit fasteningmember according to the fifth embodiment includes a drain pipe 111, awasher 105, a first spring member 125, a sliding member 121, and atrapping pipe 131.

The drain pipe 111 is formed in an extended tubular shape, like a tube,and has a flange 113 at one end thereof. The flange 113 is radiallyoutwardly extended from an upper end thereof when seen from thelongitudinal direction of the drain pipe 111, and thus is seated on acircumference of a drain port formed in the basin 1 to be flush with atop surface of the base of the basin 1. A tubular portion of the drainpipe 111 is inserted in the drain port formed in the base of the basin1, and the flange 113 is caught by the drain port, so that the drainpipe 111 is maintained in the state of being inserted in the drain portformed in the base of the basin 1. The tubular portion of the drain pipe111 passes below the basin 1 through the drain port.

A ring-shaped packing 101 is interposed between the top surface of thebasin 1 and the flange 113 of the drain pipe 111. The basin 1 is formedwith a space to discharge the overflowed water to the drain pipe 111,and the drain pipe 111 is provided with a drain hole 12 at the sidethereof to communicate with the space. If the drain pipe 111 is insertedin the drain port formed in the base of the basin 1, the drain hole 111d is located at a position communicating with the space.

The washer 105 is formed in a ring shape, and the drain pipe 111 exposedbelow the basin 1 is fitted in the washer 105 in such a way that thewasher can be slid along the tubular portion of the drain pipe 111 inthe longitudinal direction. When the drain pipe 111 is installed, thebasin 1 is positioned between the washer 105 and the flange 113 of thedrain pipe 111, and is pressed by the washer 105 and the flange 113 fromboth sides. The washer 105 presses the bottom surface of the basin 1.Another packing 101 is provided between the washer 105 and the bottomsurface of the basin 1. The packing 101 is formed in a ring shape, andthe tubular portion of the drain pipe 111 is fitted in the packing 101.The tubular portion of the drain pipe 1 exposed below the basin 1 isfitted to the packing 101 and the washer 105.

The washer 105 presses the bottom surface of the base of the basin 1 inthe upward direction by the resilient force of the first spring member125 which will be described later, thereby fixing the drain pipe 111 tothe basin 1.

The first spring member 125 may be made of a coil spring or a rubber orsynthetic resin tube, and is positioned between the washer 105 and thesliding member 121. If the first spring member 125 is made of the rubberor synthetic resin tube, the first spring member has a circular crosssection, and is formed with a plurality of holes on its side for thepurpose of resilient force.

The lower end of the first spring member 125 is upwardly pressed by theupper end of the sliding member 121, and the upper end is supported bythe washer 105. The first spring member 125 is compressed between theupper end of the sliding member 121 and the bottom surface of the baseof the basin 1. If the washer 105 is provided, the first spring member125 presses the washer 105 against the bottom surface of the basin 1.

The sliding member 121 is coupled to the drain pipe 111 which isinserted to the drain hole formed in the base of the basin 1 and then isexposed below the basin 1, and presses the first spring member 125against the basin 1.

The sliding member 121 is formed of a hollow body, as illustrated inFIG. 28, and the drain pipe 111 is inserted in the sliding member 121.If the sliding member 121 is connected to the drain pipe 111 and thuscompresses the first spring member 125, the upper end of the firstspring member 125 presses the bottom surface of the basin 1, and adownward load is applied to the drain pipe 111. Therefore, the basin 1is pressed between the flange 113 and the first spring member 125, andthe drain pipe 111 is coupled to the basin 1.

Since the first spring member 125 resiliently presses the bottom surfaceof the basin 1 in the upward direction by the sliding member 121, thebasin 1 and the drain pipe 111 are fastened to each other. Specifically,the drain pipe 111 is configured to be fastened to the basin 1 by thesliding member 121 and the first spring member 125. The upper portion ofthe sliding member 121 may be provided with a flange 113 which isbrought into contact with the lower end of the first spring member 125to press the lower end thereof. The flange 113 extends radially from theouter peripheral surface of the upper end of the sliding member 121, sothat it is easily held by a hand of an installer. The flange 113 may beprovided at a position below the upper end of the sliding member 121, sothat a protruding portion from the upper portion of the flange 113 isinserted in the first spring member 125.

The sliding member 121 is provided at the upper portion of the trappingpipe 131 which will be described later. In FIG. 26, reference numeral 42indicates a threaded portion, by which the sliding member 121 isfastened to the trapping pipe 131.

The trapping pipe 131 has the sling member 121 on the upper portionthereof. In FIG. 26, reference numeral 1313 indicates a pipe couplingportion which is provided on the upper portion of the trapping pipe 131to be connected with the sliding member 121. In the case of thread-typeengagement, the pipe coupling portion 1313 may be formed with a threadedportion. The trapping pipe 131 is to collect the water in a trap with abent flow path, thereby preventing gases or bad smells from beingflowing backward, or alien matters or bugs from coming in. The trappingpipe 131 has upper and lower pipes to be coupled to the drain portformed in the base of the basin 1. A portion of the pipe may be formedof a corrugated pipe to be corrugated in a vertical direction.

The sliding member 121 may be engaged with the trapping pipe 131 in aninterference-fitting manner, or be formed integrally with the trappingpipe 131. A portion of the upper pipe of the trapping pipe 131 may bethe sliding member 121.

The trapping pipe 131 is formed of a hollow body, and has a firstpartition 1311 and a second partition 1312 therein. The first partition1311 is downwardly extended at an angle from the upper portion, whilethe second partition 1312 is upwardly extended at an angle from a lowerportion. The lower end of the first partition 1311 is formed lower thanthe upper end of the second partition 1312, and thus the water is filledin the trapping flow path formed between the first and secondpartitions. Specifically, with the configuration of the first partition1311 and the second partition 1312, the inside of the trapping pipe 131is provided with a U-shaped bent flow path. The inclined direction ofthe first partition 1311 may be formed in parallel with that of thesecond partition 1312. The trapping pipe 131 may be made of a U-shapedpipe.

The sliding member 121 can be provided as various modes, and concreteexamples will be described later.

At least one O-ring 55 is provided between the sliding member 121 andthe drain pipe 111, and the sliding member 121 is engaged, with thetrapping pipe 131 in the interference-fitting manner. A plurality ofO-rings 55 may be provided on the sliding member 121 to be spaced apartfrom each other in the longitudinal direction. The inner peripheralsurface of the sliding member 121 is formed with an O-ring groove 55 afor receiving the O-ring 55. The O-ring groove may be formed on theouter peripheral surface of the drain pipe 111.

The O-ring 55 is made of an elastic material, such as rubber, and isseated in the O-ring groove 55 a. The inner diameter of the O-ring 55seated in the O-ring groove 55 a is smaller than the outer diameter ofthe drain pipe 111. If the sliding member 121 is upwardly moved alongthe longitudinal direction by applying the external force to the slidingmember, the drain pipe 111 is slid in the sliding member 121, and thenthe first spring member 125 is compressed by the bottom surface of thebasin 1 and the sliding member 121. If the washer 105 is fitted to thedrain pipe 111, the top surface of the washer 105 is brought intocontact with the bottom surface of the basin 1, and the first springmember 125 is compressed between the bottom surface of the washer 105and the upper end of the sliding member 121.

If the sliding member 121 is upwardly moved until the drain pipe 111 isfitted to the O-ring 55, the drain pipe 111 is fitted to the O-ring 55in the interference-fitting manner. Since the drain pipe 111 is fittedto the O-ring 55, even though the external force is not applied to thesliding member 121 after the sliding member 121 is engaged to the drainpipe 111, the sliding member 121 is not slid downwardly from the drainpipe 111 by the elastic force and the frictional force of the O-ring 55.

The sliding member 121 may have the inner diameter smaller than theouter diameter of the drain pipe 111, so that the sliding member 121 andthe drain pipe 111 are coupled to each other in the interference-fittingmanner. In this instance, the O-ring 55 may not be provided.

Meanwhile, FIG. 28 is the perspective view illustrating the couplingportion of the drain pipe assembly for installation of the washstandaccording to a variation of FIG. 26. FIG. 29 is the enlargedcross-sectional view illustrating the coupling portion and the drain,pipe in the drain pipe assembly for installation of the washstandaccording to the variation of FIG. 26.

The sliding member 121 may be engaged to the drain pipe 111 by a lockingboss and a locking groove. Referring to FIGS. 28 and 29, the outerperipheral surface of the drain pipe 111 is provided with at least onelocking boss 111 b protruding in a radial direction. One or more lockingbosses 111 b are formed in the circumferential direction.

The inner peripheral surface of the sliding member 121 is formed with afitting groove 121 c extending downwardly from the upper end to receivethe locking boss 111 b in the longitudinal direction. Also, the innerperipheral surface of the sliding, member 121 is formed with a lockinggroove 121 d having a shoulder to prevent the locking boss 111 b, whichis inserted in the fitting groove 121 c, from coming out. The lockinggroove 121 d is formed on the inner peripheral surface of the slidingmember 121 in the circumferential direction. The locking groove 121 d isformed below the upper end of the sliding member 121. A circumferentialend of the locking groove 121 d is connected to the fitting groove 121c.

The outer diameter of the drain pipe 111 is smaller than the innerdiameter of the sliding member 121, and the portion formed with thelocking boss 111 b is larger than the inner diameter of the sliding,member 121. The portion formed with the locking boss 111 b is smallerthan the portion formed with the fitting groove 121 c and the lockinggroove 121 d. When the drain pipe 111 is inserted in the sliding member121, the drain pipe is not inserted by the locking boss 111 b. However,if the drain pipe 111 is inserted in the sliding member 121 by aligningthe locking boss 111 b with the fitting groove 121 c, the drain pipe 111is slidably inserted in the sliding member 121. The locking boss 111 bis inserted in the fitting groove 121 c, and then is slid in thedownward direction.

After the fitting groove 121 c is aligned with the locking boss 111 b inthe state in which the sliding member 121 is positioned at the lowerportion of the drain pipe 111, the sliding member 121 is inserted in thedrain pipe 111 to the upward direction. Then, the drain pipe 111 isfitted to the sliding member 121 until the locking boss 111 b reachesthe position of the locking groove 121 d, and the sliding member 121 isrotated with respect to the drain pipe 111, so that the locking boss 111b moves along the locking groove 121 d while does not come out m thevertical direction by the locking shoulder. Accordingly, the slidingmember 121 is fixed to the drain pipe 111. The locking shoulder isformed on the upper and lower portions of the locking groove 121 d.

In this instance, the first spring member 125 is compressed between thebottom surface of the basin 1 and the upper end of the sliding member121. In FIG. 29, reference numeral 55 indicates an O-ring, and referencenumeral 55 a indicates an O-ring groove formed on the inner surface ofthe sliding member 121 to receive the O-ring 55. The O-ring groove 55 ais formed in a concave shape at a position below the locking groove 121d in the longitudinal direction.

If the sliding member 121 is separated from the drain pipe 111, thesliding member 121 is rotated until the locking boss 111 b sliding alongthe locking groove 121 d reaches the locking groove 121 d, and then thelocking boss 111 b is slid along the fitting groove 121 c. And, thesliding member 121 is moved downwardly to separate from the drain pipe111.

FIG. 30 is the enlarged cross-sectional view illustrating the couplingportion and the drain pipe in the drain pipe assembly for installationof the washstand according to another variation of FIG. 26.

Referring to FIG. 30, the sliding member 121 may further have thelocking member which is illustrated in FIG. 26. Specifically, thelocking boss 111 b protrudes from the outer peripheral surface of thedrain pipe 111 to support the O-ring 55 from the lower side. The lockingboss 111 b may protrude in a ring shape along the circumferentialdirection from the outer peripheral surface of the drain pipe 111, orplural locking bosses 111 b may be spaced apart from each other in thecircumferential direction. The inner diameter of the sliding member 121has a size so as not to be caught by the locking boss 111 b.

The locking boss 111 b of the drain pipe 111 is formed to be larger thanthe inner diameter of the O-ring 55.

At least one O-ring 55 is provided between the sliding member 121 andthe drain pipe 111. A plurality of O-rings 55 may be provided on thesliding member 121 to be spaced apart from each other in thelongitudinal direction. The inner peripheral surface of the slidingmember 121 is formed with an O-ring groove 55 a for receiving the O-ring55. The O-ring 55 is made of an elastic material, such as rubber, and isseated in the O-ring groove 55 a.

If the sliding member 121 is upwardly moved along the longitudinaldirection of the drain pipe 111 by applying the external force to thesliding member, the locking boss 111 b is brought into contact with theO-ring 55, and thus the O-ring is deformed and expanded. After thelocking boss 111 b passes the O-ring 55, the O-ring 55 is againcontracted. The locking boss 111 b is positioned below the O-ring 55 tosupport the O-ring 55. The first spring member 125 is compressed by thebottom surface of the basin 1 and the sliding member 121. Since theO-ring 55 is seated in the O-ring groove 5% of the sliding member 121,when the O-ring 55 is supported below the locking boss 111 b, thesliding member 121 is also supported by the O-ring 55, therebypreventing the sliding member from being released from the drain pipe111 toward the lower side.

The locking boss 111 b supports the lower portion of the O-ring 55 toobtain the fixing force stronger than that of the embodiment in FIG. 26.

In addition, the outer peripheral surface of the lower end of the drainpipe 111 may be formed with a threaded portion, and the inner peripheralsurface of the sliding member 121 may be formed with a threaded portion,thereby threadedly engaging the drain pipe 111 and the sliding member121. If the sliding member 121 is threadedly engaged to the drain pipeIll and then is moved upwardly, the first spring member 125 iscompressed between the basin 1 and the sliding member 121.

Alternatively, as disclosed in Korean Unexamined Utility ModelPublication No. 20-2010-0011061, the sliding member 121 may be made, ofa coupling for a hydraulic hose, and the outer peripheral surface of thedrain pipe 111 may be formed with a groove, thereby engaging the slidingmember 121 to the drain pipe 111. When the sliding member 121 is coupledto the drain pipe 111 by upward movement, the first spring member 125 iscompressed between the bottom surface of the basin 1 and the slidingmember 121.

FIG. 31 is a front view illustrating the drain pipe assembly forinstallation of the washstand including a clamp fastening memberaccording to the sixth embodiment of the present invention. FIG. 32 isan exploded front view of the drain pipe in FIG. 31, FIG. 33 is across-sectional view taken along the line A-A in FIG. 32. FIG. 34 is adiagram of a variation of FIG. 33. FIG. 35 is a front view illustratinga sliding member of the drain pipe assembly in FIG. 31. FIG. 36 is across-sectional view taken along a longitudinal direction of the slidingmember in FIG. 35. FIG. 37 is a plan view illustrating the slidingmember in FIG. 35. FIG. 38 is a plan view illustrating a clamp memberwhich is one example of the clamp fastening member according to thesixth embodiment. FIG. 39 is a perspective view of a variation, of FIG.38. FIG. 40 is a partially cross-sectional view illustrating a state inwhich the drain pipe and the sliding member are coupled to each other bythe clamp member of the drain pipe assembly for installation of thewashstand in FIG. 31. FIG. 41 is a partially cross-sectional viewillustrating the coupling state of the drain pipe and the sliding memberin the drain pipe assembly for installation of the washstand in FIG. 36.FIG. 42 is a cross-sectional view taken along a longitudinal directionof the sliding member in FIG. 41. FIG. 43 is a plan view illustrating aclamp washer of the drain pipe assembly for installation of thewashstand in FIG. 41. FIG. 44 is a cross-sectional view of an uppercoupling pipe in FIG. 31. FIG. 45 is a perspective view of a trappingcover in FIG. 44. FIG. 46 is a bottom view of the trapping cover.

Hereinafter, in FIG. 31 the vertical direction is referred to as alongitudinal direction, a direction extending from a flange to a packingmember is referred to as a downward direction, and a direction extendingfrom the packing member to the flange is referred to as an upwarddirection.

As illustrated in FIG. 31, a drain pipe assembly 100 for installation ofa washstand according to the sixth embodiment includes a drain pipe 111and a fastening member. The drain pipe 111 is inserted in the drain portformed, in the base of the basin 1, and then is exposed below the basin1. The fastening member is coupled to the drain pipe 111 which isexposed below the basin 1, so as to fix the drain pipe 111 to the basin1. The drain pipe 111 has a flange 113 at an upper end thereof. Theflange 113 is caught by an upper end of the drain port formed in thebase of the basin 1, and the drain pipe 111 is made of a hollow bodyextending downwardly from the flange 113. The drain pipe 111 is a tubehaving a circular cross section.

The drain pipe 111 is fitted to a packing 101, and the top surface ofthe packing 101 is brought into contact with the bottom surface of theflange 113. The bottom surface of the packing 101 is brought intocontact with the upper end of the drain port formed in the base of thebasin 1 to seal between the drain pipe 111 and the upper end of thedrain port, thereby preventing water from leaking. The drain pipe 111 isfitted to another packing 101, and the upper end of the packing 101 isbrought into contact with the lower end of the drain port formed in thebase of the basin 1. The packing 101 seals between the drain pipe 111and the lower end of the drain port, thereby preventing water fromleaking. The drain pipe 111 is fitted to a washer 105, and the topsurface of the washer is brought into contact with the bottom surface ofthe packing 101. The bottom surface of the washer 105 is brought intocontact with the upper end of a first spring member 125, and then ispressed in the upward direction. The washer 105 transfers the upwardlypressing force of the first spring member 125 to the packing 101.

The upper end of the first spring member 125 is brought into contactwith the bottom surface of the washer 105 to press the washer in theupward direction. The lower end of the first spring member 125 isbrought into contact with the upper end of the sliding member 121 topress the sliding member in the downward direction.

Accordingly, the external force is applied to the flange 113 of thedrain pipe 111 to pull the drain pipe down, so that the drain pipe 111is brought into close contact with the basin 1.

The fastening member consists of the sliding member 121, a clamp member141 to, fix the sliding member 121 and the drain pipe 111, and the firstspring member 125. The drain pipe 111 exposed below the basin 1 isslidably inserted in the sliding member 121. The clamp member 141 ispositioned between the sliding member 121 and the drain pipe 111. Theclamp member 141 is configured to clamp a recessed groove 111 a formedon the outside of the outer portion of the drain pipe 111 and thus holdthe sliding member 121. The drain pipe 111 is inserted in the firstspring member 125 in the vertical direction. The first spring member 125is inserted in the sliding member 121 through a spring groove 1218. Thefirst spring member 125 is positioned between the basin 1 and thesliding member 121, and is compressed therebetween, thereby pressing thesliding member 121 in the downward direction and thus fixing the basin 1and the drain pipe 111.

The sliding member 121 can be connected to the upper end of an uppercoupler 151 which guides the water flowing along the drain pipe 111 to adrain.

The lower end of the upper coupler 151 consist, lower coupler 135 forguide the water from the washstand to sewer and the extension 1215connected to lower end of the upper coupler 151.

The lower coupler 135 has a joint member 137 fitted in the lower coupler135, and a packing member 139 fitted in the drain. The joint member 137is positioned the upper coupler 151 and a floor in which the drain isformed.

The upper coupler 151 is made of a hollow body which is fitted in acoupler groove 1219 formed on the lower end of the sliding member 121and then is tightly fixed to a coupler shoulder 1219 a. The extension1215 is engaged to the lower end of the upper coupler 151. The extension1215 is made of a corrugated hollow pipe which is made of a softmaterial to adjust the position of the pipe depending upon the positionof the drain. The lower coupler 135 is made of a hollow pipe, of whichthe upper end is coupled to the lower end of the extension 1215, and thelower end is coupled to the drain.

The joint member 137 is formed in a ring shape to receive the lowercoupler 135, of which the bottom surface is brought into close contactwith the floor having the drain. The packing member 139 receives thelower coupler 135, of which the upper portion is brought into contactwith the bottom surface of the joint member 137, and the lower portionis inserted and fixed to the drain. The packing member 139 is to preventthe water from leaking outwardly from the drain together with the jointmember 137.

As illustrated in FIG. 32, the drain pipe 111 is formed with a lateralslot 117 and a recessed groove 111 a. The lateral, slot 117 is formed inthe drain pipe 111 to be positioned between the flange 113 and therecessed groove 111 a in the longitudinal direction. The lateral slot117 penetrates the drain pipe in a lateral direction. The lateral slot117 serves as a passage through the water overflowing from the basin 1is discharged.

As illustrated in FIGS. 32 and 33, the recessed groove 111 a is formedat a position above the lower end of the drain pipe 111, and is extendedin the circumferential direction.

Alternatively, as illustrated in FIG. 34, the recessed grooves 111 a maybe formed in parallel with each other at opposite outer sides above thelower end of the drain pipe 111.

As illustrated in FIGS. 35 to 37, the sliding member 121 is made of ahollow body, through which the drain pipe 111 is slidably inserted. Thesliding member 121 is formed with a lateral slit 1217 a, through whichthe clamp member 141 protrudes. The lateral slot 1217 a provides a spaceto manipulate the clamp member 141, thereby carrying out the clampingprocess through the lateral slot.

The inner portion of the sliding member 121 is formed with a seatportion 1215 at a position below the upper end thereof. The first springmember 125 is brought into contact with the seat portion 1215. The seatportion 1215 is radially inwardly extended to form a convex portion. Theclamp groove 1217 for receiving the clamp member 141 is recessed on theinner portion of the sliding member at a position below the seat portion1215. An O-ring groove 55 a is formed on the inner portion of thesliding member at a position below the clamp groove 1217. The O-ring 55is seated in the O-ring groove 55 a. The O-ring 55 performs a sealingoperation between the drain pipe 111 and the sliding member 121. Thelowermost end of the inner portion of the sliding member 121 is formedwith a coupler shoulder 1219 a at a position below the O-ring groove 55a The coupler shoulder 1219 a is radially inwardly extended to form aconvex portion. The shoulder surface of the coupler shoulder 1219 afaces downward. The coupler shoulder 1219 a is configured to bring theupper coupler 151 into close contact with the sliding member 121.

As illustrated in FIG. 38, the clamp member 141 has an arc-shapedportion 1411 and grip portions 1413. The arc-shaped portion 1411 clampsthe recessed groove 111 a, and the grip portions 1413 are extended fromboth ends of the arc-shaped portion 1411 and are exposed outwardly fromthe lateral slit 1217 a If the grip portions 1413 are pressed, thearc-shaped portion 1411 is deformed. A subtended angle of the arc-shapedportion 1411 is set to be larger than 180 degrees.

The grip portions 1413 are respectively provided at both ends of thearc-shaped portion 1411, and are extended from the ends of thearc-shaped portion 1411. An angle of a tangential line extended from thegrip portions 1413 and the ends of the arc-shaped portion makes about 90degrees.

Antiskid portions 1415 are extended from both ends of the grip portions1413 at an angle of 120 degrees or less.

As illustrated in FIG. 39, the clamp member 141 may have a crossedarc-shaped portion 1411. The modified clamp member 141 has thearc-shaped portion 1411 and grip portions 1413. The arc-shaped portion1411 clamps the recessed groove 111 a, and the grip portions 1413 areextended from both ends of the arc-shaped portion 1411 and are exposedoutwardly from the lateral slit 1217 a. Both ends of the arc-shapedportion 1411 are crossed each other. The grip portions 1413 are extendedfrom both crossed ends of the arc-shaped portion 1411. The grip portion1413 extended from one end of the arc-shaped portion 1411 is referred toas the other grip portion 1413, while the grip portion 1413 extendedfrom the other end of the arc-shaped portion 1411 is referred to as onegrip portion 1413. An angle formed by a tangential line extended from acrossed center of both ends of the arc-shaped portion 1411 and the gripportions 1413 is about 90 degrees.

Accordingly, on the contrary to the clamp member 141 illustrated in FIG.38, if the grip portions 1413 are radially inwardly pressed, thediameter of the arc-shaped portion 1411 is increased, and thus the drainpipe 111 is fitted in the arc-shaped portion. If the pressure radiallyinwardly applied to the grip portions 1413 is released after the clampmember is aligned with the recessed groove 111 a, the diameter of thearc-shaped portion 1411 to clamp the recessed groove 111 a and thus fixthe drain pipe 111.

As illustrated in FIG. 40, the outer diameter of the arc-shaped portionis caught by the inner end of the clamp groove 1217 in the state inwhich the arc-shaped portion 1411 of the clamp member 141 clamps therecessed groove 111 a, and thus the drain pipe 111 and the slidingmember 121 are engaged to each other so as not to be moved in thelongitudinal direction.

As illustrated in FIGS. 41 to 43, the fastening member according to thevariation of the clamp fastening member includes a sliding member 121, aclamp washer 161, and a first spring member 125. The drain pipe 111exposed below the basin is, inserted in the first spring member 125 andthe clamp washer 161 in order.

The sliding member 121 is made of a hollow body through which the drainpipe 111 can be slidably inserted.

The inner portion of the upper end of the sliding member 121 is formedwith a drain groove 1218 a. The drain groove 1218 a is extended in thecircumferential direction to receive the drain pipe 111 and the firstspring member 125. The inner portion of the sliding member 121 is formedwith an inclined washer shoulder 2214 below the drain groove 1218 a.

If the clamp washer 161 is brought into contact with the washer shoulder2214, the clamp washer 161 is pivotally moved in the sliding member 121.The drain pipe 111 is fitted to the clamp washer 161.

The drain pipe 111 is inserted in the first spring member 125 in thevertical direction. The first spring member 125 is positioned betweenthe basin 1 and the clamp washer 161. The first spring member 125downwardly presses the clamp washer 161 and the sliding member 121 tofix the sliding member 121 to the drain pipe 111.

As illustrated in FIG. 42, the sliding member 121 has a washer shoulder2214, a pivot portion 2212, and a clearance hole 2216. The washershoulder 2214 is inclined upwardly, and the pivot portion 2212 is formedat the uppermost position of the washer shoulder 2214. The pivot portion2212 is configured to receive a protrusion 1613 of the clamp washer 161so as to be pivotally moved. The clearance hole 2216 penetrates thesliding member in a lateral direction at a position opposite to thepivot portion 2212. The clearance hole 2216 is formed at the lowermostposition of the washer shoulder 2214. The clearance hole 2216 isvertically extended to secure a space in which an extended protrusion1615 of the clamp washer 161 can be moved in the vertical direction. Thesliding member 121 can be set to a proper position by manipulating theclamp washer 161 through the clearance hole 2216.

The washer shoulder 2214 is formed at the lower end of the clearancehole 2216 and the pivot portion 2212. The clamp washer 161 is seated onthe washer shoulder 2214 by the first spring member 125. The washershoulder 2214 is circumstantially inwardly extended at an angle to beformed in a convex shape. The O-ring groove 55 a is formed at a positionbelow the washer shoulder 2214. The inside of the O-ring groove 55 a isconcave in the circumferential direction to fix the O-ring 55.

The coupler shoulder 1219 a is formed at a position below the O-ringgroove 1217. The coupler shoulder 1219 a is convex in thecircumferential direction so that the upper coupler 131 is brought intoclose contact with the coupler shoulder.

As illustrated in FIG. 43, the clamp washer 161 is provided on thewasher shoulder 2214 formed in the sliding member 121. The clamp washer161 has a washer portion 1611, the protrusion 1613, the extendedprotrusion 1615, and a hole 1617. The washer portion 1611 is broughtinto contact with the drain pipe 111 to fix the position of the slidingmember 121. The protrusion 1613 is inserted in the pivot portion 2212 toserve as a center point of pivot operation. The extended protrusion 1615is extended at a position opposite to the pivot portion 2212. Theextended protrusion 1615 serves as a grip portion to manipulate theclamp washer 161. The hole 1617 is formed in the center of the washerportion 1611.

The washer portion 1611 is positioned on the washer shoulder 2214 in thesliding member 121. The drain pipe 111 is fitted in the washer portion1611, and then the washer portion is adjusted in a horizontal state bythe extended protrusion 1615. The posture of the washer portion 1611 ischanged in a diagonal direction from the horizontal direction due to thedownward expansion of the first spring member 125, and thus the diameterof the hole 1617 is decreased. Accordingly, the inner peripheral portionof the hole 1617 is brought into contact with the outer peripheralportion of the drain pipe 111, and thus the sliding member 121 is fixed.The protrusion 1613 protrudes in a rectangular shape from the end of thewasher portion 1611. The extended protrusion 1615 protrudes in arectangular shape to be opposite to the protrusion 1613. The hole 1617penetrates the center of the washer portion 1611. The shape of the hole1617 is determined upon the drain pipe 111 which is fitted in the hole.

The hole 1617 secures the sufficient area which is brought into contactwith the outer peripheral surface of the drain pipe 111, regardless ofthe shape of the drain pipe 111, thereby stably fixing the slidingmember 121 to the drain pipe 111.

As illustrated in FIG. 44, the upper coupler 151 is formed of a hollowpipe though which the drain pipe 111 is inserted. The lower end of theupper coupler 151 is provided with a connecting extension 1511 which, isextended in a vertical direction on the basis of the lower end. Thetrapping cover 152 is fitted to the upper portion of the connectingextension 1511.

As illustrated in FIGS. 45 and 46, the trapping cover 152 has aplate-shaped cover 1521 and a cover support 1522 extended downwardlyfrom the bottom surface of the cover 1521. The cover support 1522 isengaged to the outer peripheral surface of the upper end of theconnecting extension 1511 to support the cover 1521. A plurality ofcover supports 1522 are spaced, apart from each other in thecircumferential direction. The length of the cover support 1522 islonger than the length of the connecting extension 1511 extending fromthe bottom surface of the upper connecting pipe 151 in the longitudinaldirection.

Accordingly, when the trapping cover 152 is engaged to the connectingextension 1511, a space, through which a fluid flows, is formed betweenthe bottom surface of the cover 1521 and, the upper portion of theconnecting extension 1511. When the water does not flow through theupper coupler 151, the water remaining in the upper coupler 151 iscollected between the trapping cover 152 and the upper portion of theconnecting extension 1511 by the trapping cover 152 provided in theupper coupler 151, thereby clogging the space, through which the waterflows, and thus preventing gases or bad smells from being flowingbackward, or alien matters or bugs from coming in.

While the present invention has been described with reference to theparticular illustrative embodiments, it is not to be restricted by theembodiments but only by the appended claims. It is to be appreciatedthat those skilled in the art can change or modify the embodimentswithout departing from the scope and spirit of the present invention.

INDUSTRIAL APPLICABILITY

With the above configuration, anyone can easily assemble or disassemblethe drain pipe assembly for installation of the basin according to thepresent invention, without using special tools, and it is possible toshorten the working time. In addition, if the trapping pipe isintegrally formed, it is possible to further reduce the number ofassembling steps.

1. A drain pipe assembly for installation of a basin, comprising: adrain pipe (111) which is inserted in a drain port formed in a base ofbasin (1) and has a flange (113) of which an upper end is caught by thedrain port; and a fastening member which fixes the basin (1) against theflange (113), wherein the fastening member pulls the drain pipe (111),which is exposed below the basin (1), in a downward direction, toupwardly press the basin (1), thereby fastening the basin (1) and thedrain pipe (111).
 2. The drain pipe assembly for installation of thebasin according to claim 1, wherein the fastening member includes asliding member (121) in which the drain pipe (111) is slidably insertedin a longitudinal direction, a first spring member (125) which receivesthe drain pipe (111), of which a lower end is brought into contact withthe sliding member (121), and an upper end is brought into contact witha bottom surface of the base of the basin (1) to resiliently press thebottom surface, and a fixing member which fixes the sliding member (121)to the drain pipe (111).
 3. The drain pipe assembly for installation ofthe basin according to claim 2, wherein the fixing member has a latch(123) which is rotatably connected to the sliding member (121), and asecond spring member (123 a) which resilient supports the latch (131) ina rotation direction to press the drain pipe (111).
 4. The drain pipeassembly for installation of the basin according to claim 3, wherein anouter peripheral surface of the drain pipe (111) is formed with arecessed groove (111 a) for receiving the latch (123).
 5. The drain pipeassembly for installation of the basin according to claim 2, wherein alower end of the drain pipe (111) is connected to a trapping pipe ofwhich a trap is filled with water by a bent flow path.
 6. The drain pipeassembly for installation of the basin according to claim 2, wherein alower end of the sliding member (121) is connected to a trapping pipe(131) of which a trap is filled with water by a bent flow path.
 7. Thedrain pipe assembly for installation of the basin according to claim 1,wherein the fastening member includes a sliding member (121) in whichthe drain pipe (111) exposed below the basin (1) is slidably inserted ina longitudinal direction, a handle (122) which is rotatably connected tothe sliding member (121), and a link member which is rotatably connectedto the handle (122) at a position spaced apart from the position wherethe handle (122) is rotatably connected to the sliding member (121), inwhich the drain pipe (111) is formed with a recessed groove (111 a), thelink member being inserted in the recessed groove and being caught bythe recessed groove.
 8. The drain pipe assembly for installation of thebasin according to claim 7, wherein the link member has a first linkmember (124 a), of which an upper end is rotatably connected to thehandle (122), and a lower end is formed with a locking groove (1242 a),and a second link member (124 b), of which an upper portion is insertedand connected to the locking groove (1242 a), and a lower portion isextended toward a side of the drain pipe (111).
 9. The drain pipeassembly for installation of the basin according to claim 8, wherein thesliding member (121) has a guide portion (126) formed with a slot whichreceives the second link member (124 h) to guide the second link membersliding in a vertical direction; a lower end of the second link member(124 b) is extended towards a side of the drain pipe (111) beyond thesliding member (121); and a spring member (125 a) is further interposedbetween the second link member (124 b) and an inner wall of the guideportion (1216) to urge the second link member (124 b) toward the drainpipe (111).
 10. The drain pipe assembly for installation of the basinaccording to claim 9, wherein the recessed groove (111 a) is formed insuch a way that an upper side is inclined in an extending direction ofthe lower end of the second link member (124 b).
 11. The drain pipeassembly for installation of the basin according to claim 1, wherein thefastening member presses a side of the drain pipe (111), and upwardlypresses a bottom surface of the base of the basin (1) in a longitudinaldirection of the drain pipe (111), thereby fastening the drain pipe(111) to the basin (1).
 12. The drain pipe assembly for installation ofthe basin according to claim 11, wherein the fastening member includes asliding member (121) in which the drain pipe (111) is slidably insertedin a longitudinal direction, a pressing member (127) which is positionedabove the sliding member (121), in which the drain pipe (111) isslidably inserted in the longitudinal direction, a first spring member(125) which is provided between the sliding member (121) and thepressing member (127), of which one side is brought into contact withthe sliding member (121), and the other side is brought into contactwith the pressing member (127) to press the pressing member (127) towardthe basin (1), and a fixing member which detachably fixes the slidingmember (121) to the drain pipe (111).
 13. The drain pipe assembly forinstallation of the basin according to claim 12, wherein the slidingmember (121) is provided on the side thereof with at least onethrough-hole (121 a) which penetrates a wall of the sliding member (121)in a widthwise direction, and the drain pipe (111) is formed with arecessed groove (111 a); the fixing member has a locking member (128)having a pressing boss (1281) which protrudes from an inner surfacethereof to face an outside of the sliding member (121), in which thesliding member (121) is slidably inserted in the longitudinal direction,a second spring member (123 b) which is provided between the slidingmember (121) and the locking member (128) to upwardly press the lockingmember (128), and a ball member (5) which is seated in the through-hole(121 a) formed in the sliding member (121); the pressing boss (1281) ofthe locking member (128) inwardly presses the ball member (5) in awidthwise direction, and the ball member (5) is inwardly exposed throughthe through-hole (121 a) and then is seated in the recessed groove (111a), so that the sliding member (121) is fastened to the drain pipe(111); and the first spring member (125) presses the pressing member(127) in an, upward direction, so that the drain pipe (111) is fastenedto the basin (1).
 14. The drain pipe assembly for installation of thebasin according to claim 13, wherein the locking member (128) has astopper boss (1282) which is positioned below the pressing boss (1281)and protrudes inwardly from the locking member in a widthwise direction,and the sliding member (121) has a seating boss (121 b) which ispositioned below the through-hole (121 a) and is extended outwardly inthe widthwise direction; and the seating boss (121 b) is positionedbetween the stopper boss (1282) and the pressing boss (1281) in thelongitudinal direction, and an end of the seating boss (121 b) ispositioned outer than an end of the stopper boss (1282) in the widthwisedirection.
 15. The drain pipe assembly for installation of the basinaccording to claim 13, wherein a widthwise distance from an inner end ofthe recessed groove (111 a) to an inner end of the pressing boss (1281)is larger than a diameter of the ball member (5), and a widthwisedistance from an outer surface of the drain pipe (111) to the inner endof the pressing boss (1281) is smaller than the diameter of the ballmember (5).
 16. The drain pipe assembly for installation of the basinaccording to claim 1, wherein the fastening member has a trappingportion (131) having a sliding member (121), and a first spring member(125) which is provided between the sliding member (121) and the basin,in which the drain pipe (111) is inserted; and the first spring member(125) is compressed between the sliding member (121) and the basin (1).17. The drain pipe assembly for installation of the basin according toclaim 16, wherein the sliding member (121) is engaged to the drain pipe(111) by an interference-fitting manner.
 18. The drain pipe assembly forinstallation of the basin according to claim 16, wherein the slidingmember (121) is threadedly engaged to the drain pipe (111).
 19. Thedrain pipe assembly for installation of the basin according to claim 16,further including an O-ring (55) between the sliding member (121) andthe drain pipe (111); the drain pipe (111) is formed with a recessedgroove, and the O-ring (55) is positioned in the recessed groove; andthe sliding member (121) is engaged to the O-ring (55) by aninterference-fitting manner.
 20. The drain pipe assembly forinstallation of the basin according to claim 16, wherein the drain pipe(111) is provided with a locking boss (111 b) which protrudes towardsthe O-ring (55); when the sliding, member (121) is engaged to the drainpipe (111), the O-ring (55) is expanded while the locking boss (111 b)passes the O-ring (55), and the locking boss (111 b) is positioned belowthe O-ring (55) to support the O-ring (55).
 21. The drain pipe assemblyfor installation of the basin according to claim 16, wherein the slidingmember (121) is formed with a fitting groove (121 c) which extendsdownwardly from the upper end in the longitudinal direction, and alocking groove (121 d) which is formed in the circumferential directionbelow the upper end, of which an end is connected to the fitting groove(121 c); the drain pipe (111) is provided with a locking boss (111 b)protruding from an outer peripheral surface thereof; and the lockingboss (111 b) is slid along the fitting groove (121 c) of the slidingmember (121), and then is slid along the locking groove (121 d) untilthe locking boss is locked to the locking groove, thereby the slidingmember (121) is engaged to the drain pipe (111).
 22. The drain pipeassembly for installation of the basin according to claim 16, whereinthe sliding member (121) is a coupling for a hydraulic hose, and thedrain pipe (111) is formed with a groove; and the sliding member (121)and the drain pipe (111) are connected to each other by couplingengagement.
 23. The drain pipe assembly for installation of the basinaccording to claim 1, wherein the fastening member includes a slidingmember (121) in which the drain pipe (111) exposed below the basin (1)is slidably inserted, a clamp member (141) which is positioned betweenthe sliding member (121) and the drain pipe (111) to clamp the drainpipe (111) and thus hold the sliding member (121), and a first springmember (125) which receives the drain pipe (111) in a vertical directionand is provided between the basin (1) and the sliding member todownwardly press the sliding member (121).
 24. The drain pipe assemblyfor installation of the basin according to claim 23, wherein the slidingmember (121) is made of a hollow body, through which the drain pipe(111) is slidably inserted, and is formed with a lateral slit (1217 a),through which the clamp member (141) protrudes.
 25. The drain pipeassembly for installation of the basin according to claim 23, wherein anouter peripheral surface of the drain pipe (111) is formed with arecessed groove (111 a), and the clamp member (141) is fitted to therecessed groove (111 a); the clamp member (141) has an arc-shapedportion (1411) which is positioned in the recessed groove (111 a), andgrip portions (1413) which are extended from both ends of the arc-shapedportion (1411) and are exposed outwardly from the lateral slit.
 26. Thedrain pipe assembly for installation of the basin according to claim 23,wherein the fastening member includes a sliding member (121) having aninclined washer shoulder (2214), in which the drain pipe (111) isslidably inserted, a clamp washer (161) which is brought into contactwith the washer shoulder (2214) and is pivotally moved in the slidingmember (121), in which the drain pipe (111) is fitted, and a firstspring member (125) which is positioned between the basin (1) and theclamp washer (161) to downwardly presses the clamp washer (161) and thesliding member (121), in which the drain pipe (111) is inserted in thevertical direction.
 27. The drain pipe assembly for installation of thebasin according to claim 23, wherein the fastening member includes asliding member (121) in which the drain pipe (111) is slidably inserted,the sliding member having an inclined washer shoulder (2214), a pivotportion (2212) which, is configured to receive a protrusion (1613) ofthe clamp washer (161) seated on the washer shoulder (2214) so that theprotrusion is pivotally moved, and a clearance hole (2216) whichpenetrates the sliding member in a lateral direction at a positionopposite to the pivot portion.
 28. The drain pipe assembly forinstallation of the basin according to claim 24, wherein a lower end ofthe sliding member (121) is connected to an upper end of an uppercoupler (151); the upper coupler (151) is made of a hollow body in whichthe drain, pipe (111) can be inserted, and a lower end of the uppercoupler (151) is provided with a connecting extension (1511) which isextended in a vertical direction on the basis of the lower end; and atrapping cover (152) is fitted to an upper portion of the connectingextension (1511).
 29. The drain pipe assembly for installation of thebasin according to claim 28, wherein the trapping cover (152) has aplate-shaped cover (1521) and a cover support (1522) which is extendeddownwardly from a bottom surface of the cover (1521); and the coversupport (1522) is engaged to an outer peripheral surface of the upperend of the connecting extension (1511) to support the cover (1521). 30.The drain pipe assembly for installation of the basin according to claim28, wherein when the trapping cover (152) is engaged to the connectingextension (1511), a space, through which a fluid flows, is formedbetween the bottom surface of the cover (1521) and the upper portion ofthe connecting extension (1511).